631552217 has 2 divisors, whose sum is σ = 631552218. Its totient is φ = 631552216.

The previous prime is 631552189. The next prime is 631552237. The reversal of 631552217 is 712255136.

631552217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581581456 + 49970761 = 24116^2 + 7069^2 .

It is a cyclic number.

It is not a de Polignac number, because 631552217 - 2¹² = 631548121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631552237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315776108 + 315776109.

It is an arithmetic number, because the mean of its divisors is an integer number (315776109).

Almost surely, 2^631552217 is an apocalyptic number.

It is an amenable number.

631552217 is a deficient number, since it is larger than the sum of its proper divisors (1).

631552217 is an equidigital number, since it uses as much as digits as its factorization.

631552217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 32.

The square root of 631552217 is about 25130.7026762086. The cubic root of 631552217 is about 857.9653618450.

The spelling of 631552217 in words is "six hundred thirty-one million, five hundred fifty-two thousand, two hundred seventeen".