631622009 has 2 divisors, whose sum is σ = 631622010. Its totient is φ = 631622008.

The previous prime is 631621981. The next prime is 631622039. The reversal of 631622009 is 900226136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 626400784 + 5221225 = 25028^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 631622009 - 2²⁸ = 363186553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631622039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315811004 + 315811005.

It is an arithmetic number, because the mean of its divisors is an integer number (315811005).

Almost surely, 2^631622009 is an apocalyptic number.

It is an amenable number.

631622009 is a deficient number, since it is larger than the sum of its proper divisors (1).

631622009 is an equidigital number, since it uses as much as digits as its factorization.

631622009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 631622009 is about 25132.0912182015. The cubic root of 631622009 is about 857.9969648866.

The spelling of 631622009 in words is "six hundred thirty-one million, six hundred twenty-two thousand, nine".