51679531 has 4 divisors (see below), whose sum is σ = 51762064. Its totient is φ = 51597000.

The previous prime is 51679517. The next prime is 51679543. The reversal of 51679531 is 13597615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13597615 = 5 ⋅2719523.

It is a cyclic number.

It is not a de Polignac number, because 51679531 - 2⁵ = 51679499 is a prime.

It is a super-2 number, since 2×51679531² = 5341547848759922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51679561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40320 + ... + 41581.

It is an arithmetic number, because the mean of its divisors is an integer number (12940516).

Almost surely, 2^51679531 is an apocalyptic number.

51679531 is a deficient number, since it is larger than the sum of its proper divisors (82533).

51679531 is an equidigital number, since it uses as much as digits as its factorization.

51679531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82532.

The product of its digits is 28350, while the sum is 37.

The square root of 51679531 is about 7188.8476823480. The cubic root of 51679531 is about 372.4827696488.

The spelling of 51679531 in words is "fifty-one million, six hundred seventy-nine thousand, five hundred thirty-one".