631948891 has 16 divisors (see below), whose sum is σ = 736280064. Its totient is φ = 531203904.

The previous prime is 631948883. The next prime is 631948901. The reversal of 631948891 is 198849136.

It is not a de Polignac number, because 631948891 - 2³ = 631948883 is a prime.

It is a super-2 number, since 2×631948891² = 798718801672259762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631948591) 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, 106386 + ... + 112168.

It is an arithmetic number, because the mean of its divisors is an integer number (46017504).

Almost surely, 2^631948891 is an apocalyptic number.

631948891 is a deficient number, since it is larger than the sum of its proper divisors (104331173).

631948891 is a wasteful number, since it uses less digits than its factorization.

631948891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6090.

The product of its digits is 373248, while the sum is 49.

The square root of 631948891 is about 25138.5936559705. The cubic root of 631948891 is about 858.1449518108.

The spelling of 631948891 in words is "six hundred thirty-one million, nine hundred forty-eight thousand, eight hundred ninety-one".