631561253 has 16 divisors (see below), whose sum is σ = 664599936. Its totient is φ = 599477760.

The previous prime is 631561223. The next prime is 631561261. The reversal of 631561253 is 352165136.

It is a cyclic number.

It is not a de Polignac number, because 631561253 - 2¹⁰ = 631560229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631561213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593600 + ... + 594662.

It is an arithmetic number, because the mean of its divisors is an integer number (41537496).

Almost surely, 2^631561253 is an apocalyptic number.

It is an amenable number.

631561253 is a deficient number, since it is larger than the sum of its proper divisors (33038683).

631561253 is a wasteful number, since it uses less digits than its factorization.

631561253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484.

The product of its digits is 16200, while the sum is 32.

The square root of 631561253 is about 25130.8824556560. The cubic root of 631561253 is about 857.9694536355.

The spelling of 631561253 in words is "six hundred thirty-one million, five hundred sixty-one thousand, two hundred fifty-three".