51631994 has 8 divisors (see below), whose sum is σ = 78172128. Its totient is φ = 25574620.

The previous prime is 51631961. The next prime is 51632039. The reversal of 51631994 is 49913615.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120422 + ... + 120849.

It is an arithmetic number, because the mean of its divisors is an integer number (9771516).

Almost surely, 2^51631994 is an apocalyptic number.

51631994 is a deficient number, since it is larger than the sum of its proper divisors (26540134).

51631994 is a wasteful number, since it uses less digits than its factorization.

51631994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241380.

The product of its digits is 29160, while the sum is 38.

The square root of 51631994 is about 7185.5406198838. The cubic root of 51631994 is about 372.3685261886.

It can be divided in two parts, 51631 and 994, that added together give a palindrome (52625).

The spelling of 51631994 in words is "fifty-one million, six hundred thirty-one thousand, nine hundred ninety-four".