55611521 has 6 divisors (see below), whose sum is σ = 64691010. Its totient is φ = 47666976.

The previous prime is 55611511. The next prime is 55611527. The reversal of 55611521 is 12511655.

It can be written as a sum of positive squares in only one way, i.e., 54538225 + 1073296 = 7385^2 + 1036^2 .

It is not a de Polignac number, because 55611521 - 2¹⁸ = 55349377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55611527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567416 + ... + 567513.

It is an arithmetic number, because the mean of its divisors is an integer number (10781835).

Almost surely, 2^55611521 is an apocalyptic number.

It is an amenable number.

55611521 is a deficient number, since it is larger than the sum of its proper divisors (9079489).

55611521 is a wasteful number, since it uses less digits than its factorization.

55611521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134943 (or 1134936 counting only the distinct ones).

The product of its digits is 1500, while the sum is 26.

The square root of 55611521 is about 7457.3132561265. The cubic root of 55611521 is about 381.6995000665.

The spelling of 55611521 in words is "fifty-five million, six hundred eleven thousand, five hundred twenty-one".