631855493 has 4 divisors (see below), whose sum is σ = 641286240. Its totient is φ = 622424748.

The previous prime is 631855409. The next prime is 631855513. The reversal of 631855493 is 394558136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631855493 - 2²⁶ = 564746629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631855403) 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, 4715273 + ... + 4715406.

It is an arithmetic number, because the mean of its divisors is an integer number (160321560).

Almost surely, 2^631855493 is an apocalyptic number.

It is an amenable number.

631855493 is a deficient number, since it is larger than the sum of its proper divisors (9430747).

631855493 is an equidigital number, since it uses as much as digits as its factorization.

631855493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9430746.

The product of its digits is 388800, while the sum is 44.

The square root of 631855493 is about 25136.7359257323. The cubic root of 631855493 is about 858.1026736181.

The spelling of 631855493 in words is "six hundred thirty-one million, eight hundred fifty-five thousand, four hundred ninety-three".