51440631 has 8 divisors (see below), whose sum is σ = 74822784. Its totient is φ = 31176120.

The previous prime is 51440617. The next prime is 51440647. The reversal of 51440631 is 13604415.

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

It is not a de Polignac number, because 51440631 - 2⁶ = 51440567 is a prime.

It is a super-2 number, since 2×51440631² = 5292277035356322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51440671) 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, 779371 + ... + 779436.

It is an arithmetic number, because the mean of its divisors is an integer number (9352848).

Almost surely, 2^51440631 is an apocalyptic number.

51440631 is a deficient number, since it is larger than the sum of its proper divisors (23382153).

51440631 is a wasteful number, since it uses less digits than its factorization.

51440631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558821.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 51440631 is about 7172.2124201672. The cubic root of 51440631 is about 371.9079217705.

The spelling of 51440631 in words is "fifty-one million, four hundred forty thousand, six hundred thirty-one".