51669531 has 24 divisors (see below), whose sum is σ = 80400320. Its totient is φ = 31869936.

The previous prime is 51669521. The next prime is 51669539. The reversal of 51669531 is 13596615.

It is not a de Polignac number, because 51669531 - 2⁹ = 51669019 is a prime.

It is a super-2 number, since 2×51669531² = 5339480867519922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51669539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3840 + ... + 10866.

Almost surely, 2^51669531 is an apocalyptic number.

51669531 is a deficient number, since it is larger than the sum of its proper divisors (28730789).

51669531 is a wasteful number, since it uses less digits than its factorization.

51669531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7095 (or 7092 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 51669531 is about 7188.1521269378. The cubic root of 51669531 is about 372.4587429345.

The spelling of 51669531 in words is "fifty-one million, six hundred sixty-nine thousand, five hundred thirty-one".