51655513 has 24 divisors (see below), whose sum is σ = 65300928. Its totient is φ = 39789792.

The previous prime is 51655501. The next prime is 51655519. The reversal of 51655513 is 31555615.

It is not a de Polignac number, because 51655513 - 2⁵ = 51655481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51655519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168106 + ... + 168412.

It is an arithmetic number, because the mean of its divisors is an integer number (2720872).

Almost surely, 2^51655513 is an apocalyptic number.

It is an amenable number.

51655513 is a deficient number, since it is larger than the sum of its proper divisors (13645415).

51655513 is a wasteful number, since it uses less digits than its factorization.

51655513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 370 counting only the distinct ones).

The product of its digits is 11250, while the sum is 31.

The square root of 51655513 is about 7187.1769840460. The cubic root of 51655513 is about 372.4250570672.

The spelling of 51655513 in words is "fifty-one million, six hundred fifty-five thousand, five hundred thirteen".