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223680161 = 297713109
BaseRepresentation
bin11010101010100…
…01011010100001
3120120220010111102
431111101122201
5424230231121
634110124145
75354151515
oct1525213241
9516803442
10223680161
11105297241
1262ab0655
1337458833
14219c8145
151498590b
hexd5516a1

223680161 has 4 divisors (see below), whose sum is σ = 231393300. Its totient is φ = 215967024.

The previous prime is 223680139. The next prime is 223680167. The reversal of 223680161 is 161086322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165920161 + 57760000 = 12881^2 + 7600^2 .

It is a cyclic number.

It is not a de Polignac number, because 223680161 - 214 = 223663777 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 7713109 = 223680161 / (2 + 2 + 3 + 6 + 8 + 0 + 1 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223680167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3856526 + ... + 3856583.

It is an arithmetic number, because the mean of its divisors is an integer number (57848325).

Almost surely, 2223680161 is an apocalyptic number.

223680161 is the 6689-th centered decagonal number.

It is an amenable number.

223680161 is a deficient number, since it is larger than the sum of its proper divisors (7713139).

223680161 is an equidigital number, since it uses as much as digits as its factorization.

223680161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7713138.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 223680161 is about 14955.9406591495. The cubic root of 223680161 is about 607.0286032442.

The spelling of 223680161 in words is "two hundred twenty-three million, six hundred eighty thousand, one hundred sixty-one".

Divisors: 1 29 7713109 223680161