631243420 has 24 divisors (see below), whose sum is σ = 1334396448. Its totient is φ = 250824000.

The previous prime is 631243369. The next prime is 631243453. The reversal of 631243420 is 24342136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101491 + ... + 107530.

It is an arithmetic number, because the mean of its divisors is an integer number (55599852).

Almost surely, 2^631243420 is an apocalyptic number.

It is an amenable number.

631243420 is an abundant number, since it is smaller than the sum of its proper divisors (703153028).

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

631243420 is a wasteful number, since it uses less digits than its factorization.

631243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209181 (or 209179 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 631243420 is about 25124.5581055668. The cubic root of 631243420 is about 857.8255052004.

Adding to 631243420 its reverse (24342136), we get a palindrome (655585556).

The spelling of 631243420 in words is "six hundred thirty-one million, two hundred forty-three thousand, four hundred twenty".