65312431 has 2 divisors, whose sum is σ = 65312432. Its totient is φ = 65312430.

The previous prime is 65312339. The next prime is 65312441. The reversal of 65312431 is 13421356.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65312431 is a prime.

It is a super-2 number, since 2×65312431² = 8531427286259522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65312396 and 65312405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65312441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32656215 + 32656216.

It is an arithmetic number, because the mean of its divisors is an integer number (32656216).

Almost surely, 2^65312431 is an apocalyptic number.

65312431 is a deficient number, since it is larger than the sum of its proper divisors (1).

65312431 is an equidigital number, since it uses as much as digits as its factorization.

65312431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 65312431 is about 8081.6106686724. The cubic root of 65312431 is about 402.7157512596.

Adding to 65312431 its reverse (13421356), we get a palindrome (78733787).

The spelling of 65312431 in words is "sixty-five million, three hundred twelve thousand, four hundred thirty-one".