631367561 has 8 divisors (see below), whose sum is σ = 689731200. Its totient is φ = 573165040.

The previous prime is 631367537. The next prime is 631367603. The reversal of 631367561 is 165763136.

631367561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 631367561 - 2¹⁸ = 631105417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631367461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32006 + ... + 47823.

It is an arithmetic number, because the mean of its divisors is an integer number (86216400).

Almost surely, 2^631367561 is an apocalyptic number.

It is an amenable number.

631367561 is a deficient number, since it is larger than the sum of its proper divisors (58363639).

631367561 is a wasteful number, since it uses less digits than its factorization.

631367561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80559.

The product of its digits is 68040, while the sum is 38.

The square root of 631367561 is about 25127.0284952280. The cubic root of 631367561 is about 857.8817351388.

The spelling of 631367561 in words is "six hundred thirty-one million, three hundred sixty-seven thousand, five hundred sixty-one".