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220911601 = 713111431
BaseRepresentation
bin11010010101011…
…01011111110001
3120101200110202011
431022231133301
5423023132401
633530522521
75321501101
oct1512553761
9511613664
10220911601
11103776179
1261b96441
13369c9631
14214a7201
15145da451
hexd2ad7f1

220911601 has 4 divisors (see below), whose sum is σ = 224023104. Its totient is φ = 217800100.

The previous prime is 220911563. The next prime is 220911623. The reversal of 220911601 is 106119022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220911601 - 211 = 220909553 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220911671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1555645 + ... + 1555786.

It is an arithmetic number, because the mean of its divisors is an integer number (56005776).

Almost surely, 2220911601 is an apocalyptic number.

It is an amenable number.

220911601 is a deficient number, since it is larger than the sum of its proper divisors (3111503).

220911601 is an equidigital number, since it uses as much as digits as its factorization.

220911601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111502.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 220911601 is about 14863.0952698286. The cubic root of 220911601 is about 604.5137371814.

The spelling of 220911601 in words is "two hundred twenty million, nine hundred eleven thousand, six hundred one".

Divisors: 1 71 3111431 220911601