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213161 = 1319863
BaseRepresentation
bin110100000010101001
3101211101212
4310002221
523310121
64322505
71545314
oct640251
9354355
10213161
11136173
12a3435
1376040
145797b
154325b
hex340a9

213161 has 8 divisors (see below), whose sum is σ = 241920. Its totient is φ = 186192.

The previous prime is 213149. The next prime is 213173. The reversal of 213161 is 161312.

It is an interprime number because it is at equal distance from previous prime (213149) and next prime (213173).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213161 - 26 = 213097 is a prime.

It is a super-2 number, since 2×2131612 = 90875223842, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213161.

It is not an unprimeable number, because it can be changed into a prime (213131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2213161 is an apocalyptic number.

It is an amenable number.

213161 is a deficient number, since it is larger than the sum of its proper divisors (28759).

213161 is a wasteful number, since it uses less digits than its factorization.

213161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895.

The product of its digits is 36, while the sum is 14.

The square root of 213161 is about 461.6936213551. The cubic root of 213161 is about 59.7359694652.

Adding to 213161 its reverse (161312), we get a palindrome (374473).

The spelling of 213161 in words is "two hundred thirteen thousand, one hundred sixty-one".

Divisors: 1 13 19 247 863 11219 16397 213161