647713631 has 2 divisors, whose sum is σ = 647713632. Its totient is φ = 647713630.

The previous prime is 647713621. The next prime is 647713679. The reversal of 647713631 is 136317746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647713631 - 2⁶ = 647713567 is a prime.

It is a super-2 number, since 2×647713631² = 839065895566408322, 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 (647713621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323856815 + 323856816.

It is an arithmetic number, because the mean of its divisors is an integer number (323856816).

Almost surely, 2^647713631 is an apocalyptic number.

647713631 is a deficient number, since it is larger than the sum of its proper divisors (1).

647713631 is an equidigital number, since it uses as much as digits as its factorization.

647713631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 647713631 is about 25450.2186827540. The cubic root of 647713631 is about 865.2222494613. Note that the first 4 decimals are identical.

The spelling of 647713631 in words is "six hundred forty-seven million, seven hundred thirteen thousand, six hundred thirty-one".