51430631 has 4 divisors (see below), whose sum is σ = 58777872. Its totient is φ = 44083392.

The previous prime is 51430597. The next prime is 51430633. The reversal of 51430631 is 13603415.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51430631 - 2⁶ = 51430567 is a prime.

It is a super-2 number, since 2×51430631² = 5290219610116322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51430597 and 51430606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51430633) 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, 3673610 + ... + 3673623.

It is an arithmetic number, because the mean of its divisors is an integer number (14694468).

Almost surely, 2^51430631 is an apocalyptic number.

51430631 is a deficient number, since it is larger than the sum of its proper divisors (7347241).

51430631 is an equidigital number, since it uses as much as digits as its factorization.

51430631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7347240.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 51430631 is about 7171.5152513259. The cubic root of 51430631 is about 371.8838207168.

The spelling of 51430631 in words is "fifty-one million, four hundred thirty thousand, six hundred thirty-one".