631478091 has 32 divisors (see below), whose sum is σ = 936263680. Its totient is φ = 376941600.

The previous prime is 631478063. The next prime is 631478101. The reversal of 631478091 is 190874136.

It is not a de Polignac number, because 631478091 - 2⁵ = 631478059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631478011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71826 + ... + 80136.

It is an arithmetic number, because the mean of its divisors is an integer number (29258240).

Almost surely, 2^631478091 is an apocalyptic number.

631478091 is a deficient number, since it is larger than the sum of its proper divisors (304785589).

631478091 is a wasteful number, since it uses less digits than its factorization.

631478091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8407.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 631478091 is about 25129.2278233932. The cubic root of 631478091 is about 857.9317937424.

The spelling of 631478091 in words is "six hundred thirty-one million, four hundred seventy-eight thousand, ninety-one".