51731431 has 4 divisors (see below), whose sum is σ = 51826552. Its totient is φ = 51636312.

The previous prime is 51731411. The next prime is 51731497. The reversal of 51731431 is 13413715.

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 51731431 - 2¹¹ = 51729383 is a prime.

It is a super-2 number, since 2×51731431² = 5352281906615522, 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 = 51731396 and 51731405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51731411) 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, 46740 + ... + 47833.

It is an arithmetic number, because the mean of its divisors is an integer number (12956638).

Almost surely, 2^51731431 is an apocalyptic number.

51731431 is a deficient number, since it is larger than the sum of its proper divisors (95121).

51731431 is an equidigital number, since it uses as much as digits as its factorization.

51731431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95120.

The product of its digits is 1260, while the sum is 25.

The square root of 51731431 is about 7192.4565344533. The cubic root of 51731431 is about 372.6074185348.

The spelling of 51731431 in words is "fifty-one million, seven hundred thirty-one thousand, four hundred thirty-one".