51864531 has 8 divisors (see below), whose sum is σ = 69339600. Its totient is φ = 34482912.

The previous prime is 51864521. The next prime is 51864551. The reversal of 51864531 is 13546815.

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

It is not a de Polignac number, because 51864531 - 2⁹ = 51864019 is a prime.

It is a super-2 number, since 2×51864531² = 5379859151699922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51864492 and 51864501.

It is not an unprimeable number, because it can be changed into a prime (51864511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22056 + ... + 24293.

It is an arithmetic number, because the mean of its divisors is an integer number (8667450).

Almost surely, 2^51864531 is an apocalyptic number.

51864531 is a deficient number, since it is larger than the sum of its proper divisors (17475069).

51864531 is a wasteful number, since it uses less digits than its factorization.

51864531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46725.

The product of its digits is 14400, while the sum is 33.

The square root of 51864531 is about 7201.7033401828. The cubic root of 51864531 is about 372.9267058847.

The spelling of 51864531 in words is "fifty-one million, eight hundred sixty-four thousand, five hundred thirty-one".