51531651 has 6 divisors (see below), whose sum is σ = 74434620. Its totient is φ = 34354428.

The previous prime is 51531631. The next prime is 51531659. The reversal of 51531651 is 15613515.

51531651 is a `hidden beast` number, since 5 + 1 + 5 + 3 + 1 + 651 = 666.

It is not a de Polignac number, because 51531651 - 2¹¹ = 51529603 is a prime.

It is a super-2 number, since 2×51531651² = 5311022109571602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51531659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2862861 + ... + 2862878.

It is an arithmetic number, because the mean of its divisors is an integer number (12405770).

Almost surely, 2^51531651 is an apocalyptic number.

51531651 is a deficient number, since it is larger than the sum of its proper divisors (22902969).

51531651 is a wasteful number, since it uses less digits than its factorization.

51531651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5725745 (or 5725742 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 51531651 is about 7178.5549381474. The cubic root of 51531651 is about 372.1271460972.

The spelling of 51531651 in words is "fifty-one million, five hundred thirty-one thousand, six hundred fifty-one".