51631865 has 8 divisors (see below), whose sum is σ = 62138880. Its totient is φ = 41185072.

The previous prime is 51631829. The next prime is 51631871. The reversal of 51631865 is 56813615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51631865 - 2⁸ = 51631609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13145 + ... + 16614.

It is an arithmetic number, because the mean of its divisors is an integer number (7767360).

Almost surely, 2^51631865 is an apocalyptic number.

It is an amenable number.

51631865 is a deficient number, since it is larger than the sum of its proper divisors (10507015).

51631865 is a wasteful number, since it uses less digits than its factorization.

51631865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30111.

The product of its digits is 21600, while the sum is 35.

The square root of 51631865 is about 7185.5316435181. The cubic root of 51631865 is about 372.3682160735.

The spelling of 51631865 in words is "fifty-one million, six hundred thirty-one thousand, eight hundred sixty-five".