631064641 has 3 divisors (see below), whose sum is σ = 631089763. Its totient is φ = 631039520.

The previous prime is 631064627. The next prime is 631064647. The reversal of 631064641 is 146460136.

The square root of 631064641 is 25121.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 286591041 + 344473600 = 16929^2 + 18560^2 .

It is not a de Polignac number, because 631064641 - 2⁷ = 631064513 is a prime.

It is a super-2 number, since 2×631064641² = 796485162240917762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631064647) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12561 + ... + 37681.

Almost surely, 2^631064641 is an apocalyptic number.

631064641 is the 25121-st square number.

631064641 is the 12561-st centered octagonal number.

It is an amenable number.

631064641 is a deficient number, since it is larger than the sum of its proper divisors (25122).

631064641 is an frugal number, since it uses more digits than its factorization.

631064641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50242 (or 25121 counting only the distinct ones).

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

The cubic root of 631064641 is about 857.7445139052.

The spelling of 631064641 in words is "six hundred thirty-one million, sixty-four thousand, six hundred forty-one".