55616513 has 4 divisors (see below), whose sum is σ = 57119700. Its totient is φ = 54113328.

The previous prime is 55616479. The next prime is 55616549. The reversal of 55616513 is 31561655.

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 43665664 + 11950849 = 6608^2 + 3457^2 .

It is a cyclic number.

It is not a de Polignac number, because 55616513 - 2²² = 51422209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55616513.

It is not an unprimeable number, because it can be changed into a prime (55616563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751538 + ... + 751611.

It is an arithmetic number, because the mean of its divisors is an integer number (14279925).

Almost surely, 2^55616513 is an apocalyptic number.

It is an amenable number.

55616513 is a deficient number, since it is larger than the sum of its proper divisors (1503187).

55616513 is a wasteful number, since it uses less digits than its factorization.

55616513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503186.

The product of its digits is 13500, while the sum is 32.

The square root of 55616513 is about 7457.6479536111. The cubic root of 55616513 is about 381.7109208827.

The spelling of 55616513 in words is "fifty-five million, six hundred sixteen thousand, five hundred thirteen".