631585398 has 8 divisors (see below), whose sum is σ = 1263170808. Its totient is φ = 210528464.

The previous prime is 631585397. The next prime is 631585433. The reversal of 631585398 is 893585136.

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

631585398 is an admirable number.

It is a super-2 number, since 2×631585398² = 797800229933636808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631585393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52632111 + ... + 52632122.

It is an arithmetic number, because the mean of its divisors is an integer number (157896351).

Almost surely, 2^631585398 is an apocalyptic number.

631585398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631585398 is a wasteful number, since it uses less digits than its factorization.

631585398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105264238.

The product of its digits is 777600, while the sum is 48.

The square root of 631585398 is about 25131.3628361058. The cubic root of 631585398 is about 857.9803870740.

The spelling of 631585398 in words is "six hundred thirty-one million, five hundred eighty-five thousand, three hundred ninety-eight".