631521042 has 16 divisors (see below), whose sum is σ = 1263453120. Its totient is φ = 210438512.

The previous prime is 631521019. The next prime is 631521053. The reversal of 631521042 is 240125136.

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, 5059 + ... + 35897.

It is an arithmetic number, because the mean of its divisors is an integer number (78965820).

Almost surely, 2^631521042 is an apocalyptic number.

631521042 is an abundant number, since it is smaller than the sum of its proper divisors (631932078).

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

631521042 is a wasteful number, since it uses less digits than its factorization.

631521042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34257.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 631521042 is about 25130.0824113253. The cubic root of 631521042 is about 857.9512445060.

Adding to 631521042 its reverse (240125136), we get a palindrome (871646178).

The spelling of 631521042 in words is "six hundred thirty-one million, five hundred twenty-one thousand, forty-two".