631131051 has 16 divisors (see below), whose sum is σ = 850742784. Its totient is φ = 416161824.

The previous prime is 631131043. The next prime is 631131073. The reversal of 631131051 is 150131136.

It is not a de Polignac number, because 631131051 - 2³ = 631131043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631131451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103966 + ... + 109868.

It is an arithmetic number, because the mean of its divisors is an integer number (53171424).

Almost surely, 2^631131051 is an apocalyptic number.

631131051 is a deficient number, since it is larger than the sum of its proper divisors (219611733).

631131051 is a wasteful number, since it uses less digits than its factorization.

631131051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 631131051 is about 25122.3217677029. The cubic root of 631131051 is about 857.7746010582.

Adding to 631131051 its reverse (150131136), we get a palindrome (781262187).

The spelling of 631131051 in words is "six hundred thirty-one million, one hundred thirty-one thousand, fifty-one".