631326647 has 8 divisors (see below), whose sum is σ = 721685376. Its totient is φ = 541010232.

The previous prime is 631326617. The next prime is 631326649. The reversal of 631326647 is 746623136.

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

It is not a de Polignac number, because 631326647 - 2¹⁴ = 631310263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631326647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631326649) 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, 33848 + ... + 49074.

It is an arithmetic number, because the mean of its divisors is an integer number (90210672).

Almost surely, 2^631326647 is an apocalyptic number.

631326647 is a deficient number, since it is larger than the sum of its proper divisors (90358729).

631326647 is a wasteful number, since it uses less digits than its factorization.

631326647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21157.

The product of its digits is 108864, while the sum is 38.

The square root of 631326647 is about 25126.2143388136. The cubic root of 631326647 is about 857.8632038671.

The spelling of 631326647 in words is "six hundred thirty-one million, three hundred twenty-six thousand, six hundred forty-seven".