631561223 has 2 divisors, whose sum is σ = 631561224. Its totient is φ = 631561222.

The previous prime is 631561213. The next prime is 631561261. The reversal of 631561223 is 322165136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631561223 - 2¹⁰ = 631560199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631561213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315780611 + 315780612.

It is an arithmetic number, because the mean of its divisors is an integer number (315780612).

Almost surely, 2^631561223 is an apocalyptic number.

631561223 is a deficient number, since it is larger than the sum of its proper divisors (1).

631561223 is an equidigital number, since it uses as much as digits as its factorization.

631561223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 631561223 is about 25130.8818587808. The cubic root of 631561223 is about 857.9694400506.

The spelling of 631561223 in words is "six hundred thirty-one million, five hundred sixty-one thousand, two hundred twenty-three".