51131536 has 20 divisors (see below), whose sum is σ = 100426732. Its totient is φ = 25214976.

The previous prime is 51131501. The next prime is 51131537. The reversal of 51131536 is 63513115.

It can be written as a sum of positive squares in 2 ways, for example, as 11943936 + 39187600 = 3456^2 + 6260^2 .

It is a super-2 number, since 2×51131536² = 5228867947438592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51131536.

It is not an unprimeable number, because it can be changed into a prime (51131537) 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, 20721 + ... + 23056.

Almost surely, 2^51131536 is an apocalyptic number.

It is an amenable number.

51131536 is a deficient number, since it is larger than the sum of its proper divisors (49295196).

51131536 is a wasteful number, since it uses less digits than its factorization.

51131536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43858 (or 43852 counting only the distinct ones).

The product of its digits is 1350, while the sum is 25.

The square root of 51131536 is about 7150.6318601925. The cubic root of 51131536 is about 371.1615215391.

The spelling of 51131536 in words is "fifty-one million, one hundred thirty-one thousand, five hundred thirty-six".