51655617 has 32 divisors (see below), whose sum is σ = 82844160. Its totient is φ = 31622400.

The previous prime is 51655609. The next prime is 51655627. The reversal of 51655617 is 71655615.

It is not a de Polignac number, because 51655617 - 2³ = 51655609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51655627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128617 + ... + 129017.

It is an arithmetic number, because the mean of its divisors is an integer number (2588880).

Almost surely, 2^51655617 is an apocalyptic number.

It is an amenable number.

51655617 is a deficient number, since it is larger than the sum of its proper divisors (31188543).

51655617 is a wasteful number, since it uses less digits than its factorization.

51655617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 784 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 51655617 is about 7187.1842191501. The cubic root of 51655617 is about 372.4253070062.

The spelling of 51655617 in words is "fifty-one million, six hundred fifty-five thousand, six hundred seventeen".