64630831 has 2 divisors, whose sum is σ = 64630832. Its totient is φ = 64630830.

The previous prime is 64630793. The next prime is 64630847. The reversal of 64630831 is 13803646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64630831 is a prime.

It is a super-2 number, since 2×64630831² = 8354288631501122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64630793 and 64630802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64630031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32315415 + 32315416.

It is an arithmetic number, because the mean of its divisors is an integer number (32315416).

Almost surely, 2^64630831 is an apocalyptic number.

64630831 is a deficient number, since it is larger than the sum of its proper divisors (1).

64630831 is an equidigital number, since it uses as much as digits as its factorization.

64630831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 64630831 is about 8039.3302581745. The cubic root of 64630831 is about 401.3099367316.

The spelling of 64630831 in words is "sixty-four million, six hundred thirty thousand, eight hundred thirty-one".