51431136 has 24 divisors (see below), whose sum is σ = 135006984. Its totient is φ = 17143680.

The previous prime is 51431131. The next prime is 51431153. The reversal of 51431136 is 63113415.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51431131) 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, 267775 + ... + 267966.

It is an arithmetic number, because the mean of its divisors is an integer number (5625291).

Almost surely, 2^51431136 is an apocalyptic number.

It is an amenable number.

51431136 is an abundant number, since it is smaller than the sum of its proper divisors (83575848).

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

51431136 is a wasteful number, since it uses less digits than its factorization.

51431136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535754 (or 535746 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 51431136 is about 7171.5504599773. The cubic root of 51431136 is about 371.8850378949.

The spelling of 51431136 in words is "fifty-one million, four hundred thirty-one thousand, one hundred thirty-six".