51551656 has 32 divisors (see below), whose sum is σ = 106916040. Its totient is φ = 23148288.

The previous prime is 51551653. The next prime is 51551657. The reversal of 51551656 is 65615515.

It can be written as a sum of positive squares in 4 ways, for example, as 32103556 + 19448100 = 5666^2 + 4410^2 .

It is not an unprimeable number, because it can be changed into a prime (51551653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2851 + ... + 10546.

Almost surely, 2^51551656 is an apocalyptic number.

It is an amenable number.

51551656 is an abundant number, since it is smaller than the sum of its proper divisors (55364384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51551656 is a wasteful number, since it uses less digits than its factorization.

51551656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13453 (or 13449 counting only the distinct ones).

The product of its digits is 22500, while the sum is 34.

The square root of 51551656 is about 7179.9481892281. The cubic root of 51551656 is about 372.1752941143.

The spelling of 51551656 in words is "fifty-one million, five hundred fifty-one thousand, six hundred fifty-six".