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56616561 = 3219536247
BaseRepresentation
bin1101011111111…
…0011001110001
310221112102022200
43113332121301
5103443212221
65341253413
71255142601
oct327763161
9127472280
1056616561
1129a5a951
1216b64269
13b963c31
14773ac01
154e85426
hex35fe671

56616561 has 24 divisors (see below), whose sum is σ = 87721920. Its totient is φ = 35077536.

The previous prime is 56616533. The next prime is 56616563. The reversal of 56616561 is 16561665.

It is not a de Polignac number, because 56616561 - 27 = 56616433 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56616563) 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 23 ways as a sum of consecutive naturals, for example, 5940 + ... + 12186.

It is an arithmetic number, because the mean of its divisors is an integer number (3655080).

Almost surely, 256616561 is an apocalyptic number.

It is an amenable number.

56616561 is a deficient number, since it is larger than the sum of its proper divisors (31105359).

56616561 is a wasteful number, since it uses less digits than its factorization.

56616561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325 (or 6322 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 56616561 is about 7524.3977167611. The cubic root of 56616561 is about 383.9852085774.

The spelling of 56616561 in words is "fifty-six million, six hundred sixteen thousand, five hundred sixty-one".

Divisors: 1 3 9 19 53 57 159 171 477 1007 3021 6247 9063 18741 56223 118693 331091 356079 993273 1068237 2979819 6290729 18872187 56616561