65631431 has 2 divisors, whose sum is σ = 65631432. Its totient is φ = 65631430.

The previous prime is 65631413. The next prime is 65631439. The reversal of 65631431 is 13413656.

It is a happy number.

Together with previous prime (65631413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65631431 - 2⁶ = 65631367 is a prime.

It is a super-2 number, since 2×65631431² = 8614969470215522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65631394 and 65631403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65631439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32815715 + 32815716.

It is an arithmetic number, because the mean of its divisors is an integer number (32815716).

Almost surely, 2^65631431 is an apocalyptic number.

65631431 is a deficient number, since it is larger than the sum of its proper divisors (1).

65631431 is an equidigital number, since it uses as much as digits as its factorization.

65631431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 65631431 is about 8101.3227932233. The cubic root of 65631431 is about 403.3703368975.

The spelling of 65631431 in words is "sixty-five million, six hundred thirty-one thousand, four hundred thirty-one".