51631959 has 4 divisors (see below), whose sum is σ = 68842616. Its totient is φ = 34421304.

The previous prime is 51631901. The next prime is 51631961. The reversal of 51631959 is 95913615.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51631959 - 2¹⁹ = 51107671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51635959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8605324 + ... + 8605329.

It is an arithmetic number, because the mean of its divisors is an integer number (17210654).

Almost surely, 2^51631959 is an apocalyptic number.

51631959 is a deficient number, since it is larger than the sum of its proper divisors (17210657).

51631959 is a wasteful number, since it uses less digits than its factorization.

51631959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17210656.

The product of its digits is 36450, while the sum is 39.

The square root of 51631959 is about 7185.5381844368. The cubic root of 51631959 is about 372.3684420489.

The spelling of 51631959 in words is "fifty-one million, six hundred thirty-one thousand, nine hundred fifty-nine".