51431 has 2 divisors, whose sum is σ = 51432. Its totient is φ = 51430.

The previous prime is 51427. The next prime is 51437. The reversal of 51431 is 13415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51431 - 2² = 51427 is a prime.

It is a super-2 number, since 2×51431² = 5290295522, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51431.

It is not a weakly prime, because it can be changed into another prime (51437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25715 + 25716.

It is an arithmetic number, because the mean of its divisors is an integer number (25716).

2⁵¹⁴³¹ is an apocalyptic number.

51431 is a deficient number, since it is larger than the sum of its proper divisors (1).

51431 is an equidigital number, since it uses as much as digits as its factorization.

51431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 14.

The square root of 51431 is about 226.7840382390. The cubic root of 51431 is about 37.1884710101.

Adding to 51431 its reverse (13415), we get a palindrome (64846).

It can be divided in two parts, 514 and 31, that added together give a palindrome (545).

The spelling of 51431 in words is "fifty-one thousand, four hundred thirty-one".