631404137 has 32 divisors (see below), whose sum is σ = 791062272. Its totient is φ = 490696704.

The previous prime is 631404133. The next prime is 631404139. The reversal of 631404137 is 731404136.

631404137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 631404137 - 2² = 631404133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631404133) 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, 2056538 + ... + 2056844.

It is an arithmetic number, because the mean of its divisors is an integer number (24720696).

Almost surely, 2^631404137 is an apocalyptic number.

It is an amenable number.

631404137 is a deficient number, since it is larger than the sum of its proper divisors (159658135).

631404137 is a wasteful number, since it uses less digits than its factorization.

631404137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 631404137 is about 25127.7563065229. The cubic root of 631404137 is about 857.8983009125.

Subtracting 631404137 from its reverse (731404136), we obtain a palindrome (99999999).

The spelling of 631404137 in words is "six hundred thirty-one million, four hundred four thousand, one hundred thirty-seven".