51631587 has 40 divisors (see below), whose sum is σ = 90337632. Its totient is φ = 28771200.

The previous prime is 51631579. The next prime is 51631589. The reversal of 51631587 is 78513615.

It is not a de Polignac number, because 51631587 - 2³ = 51631579 is a prime.

It is a super-2 number, since 2×51631587² = 5331641552277138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51631589) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22137 + ... + 24357.

Almost surely, 2^51631587 is an apocalyptic number.

51631587 is a deficient number, since it is larger than the sum of its proper divisors (38706045).

51631587 is a wasteful number, since it uses less digits than its factorization.

51631587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281 (or 2272 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 51631587 is about 7185.5122990640. The cubic root of 51631587 is about 372.3675477618.

The spelling of 51631587 in words is "fifty-one million, six hundred thirty-one thousand, five hundred eighty-seven".