63994631 has 2 divisors, whose sum is σ = 63994632. Its totient is φ = 63994630.

The previous prime is 63994607. The next prime is 63994639. The reversal of 63994631 is 13649936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63994631 - 2¹⁰ = 63993607 is a prime.

It is a super-2 number, since 2×63994631² = 8190625593652322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63994639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31997315 + 31997316.

It is an arithmetic number, because the mean of its divisors is an integer number (31997316).

Almost surely, 2^63994631 is an apocalyptic number.

63994631 is a deficient number, since it is larger than the sum of its proper divisors (1).

63994631 is an equidigital number, since it uses as much as digits as its factorization.

63994631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 41.

The square root of 63994631 is about 7999.6644304621. The cubic root of 63994631 is about 399.9888142705.

The spelling of 63994631 in words is "sixty-three million, nine hundred ninety-four thousand, six hundred thirty-one".