631414921 has 2 divisors, whose sum is σ = 631414922. Its totient is φ = 631414920.

The previous prime is 631414909. The next prime is 631414937. The reversal of 631414921 is 129414136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370947600 + 260467321 = 19260^2 + 16139^2 .

It is a cyclic number.

It is not a de Polignac number, because 631414921 - 2²⁵ = 597860489 is a prime.

It is a super-2 number, since 2×631414921² = 797369604922872482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631414961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315707460 + 315707461.

It is an arithmetic number, because the mean of its divisors is an integer number (315707461).

Almost surely, 2^631414921 is an apocalyptic number.

It is an amenable number.

631414921 is a deficient number, since it is larger than the sum of its proper divisors (1).

631414921 is an equidigital number, since it uses as much as digits as its factorization.

631414921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 631414921 is about 25127.9708890312. The cubic root of 631414921 is about 857.9031850124.

The spelling of 631414921 in words is "six hundred thirty-one million, four hundred fourteen thousand, nine hundred twenty-one".