51455431 has 2 divisors, whose sum is σ = 51455432. Its totient is φ = 51455430.

The previous prime is 51455429. The next prime is 51455441. The reversal of 51455431 is 13455415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51455431 - 2¹ = 51455429 is a prime.

It is a super-2 number, since 2×51455431² = 5295322758791522, which contains 22 as substring.

Together with 51455429, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51455431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51455441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25727715 + 25727716.

It is an arithmetic number, because the mean of its divisors is an integer number (25727716).

Almost surely, 2^51455431 is an apocalyptic number.

51455431 is a deficient number, since it is larger than the sum of its proper divisors (1).

51455431 is an equidigital number, since it uses as much as digits as its factorization.

51455431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6000, while the sum is 28.

The square root of 51455431 is about 7173.2441057028. The cubic root of 51455431 is about 371.9435855986.

It can be divided in two parts, 514 and 55431, that added together give a triangular number (55945 = T₃₃₄).

The spelling of 51455431 in words is "fifty-one million, four hundred fifty-five thousand, four hundred thirty-one".