634540131 has 12 divisors (see below), whose sum is σ = 964798120. Its totient is φ = 400762080.

The previous prime is 634540061. The next prime is 634540141. The reversal of 634540131 is 131045436.

It is not a de Polignac number, because 634540131 - 2¹⁰ = 634539107 is a prime.

It is a super-2 number, since 2×634540131² = 805282355698994322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634540095 and 634540104.

It is not an unprimeable number, because it can be changed into a prime (634540141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1855210 + ... + 1855551.

Almost surely, 2^634540131 is an apocalyptic number.

634540131 is a deficient number, since it is larger than the sum of its proper divisors (330257989).

634540131 is a wasteful number, since it uses less digits than its factorization.

634540131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710786 (or 3710783 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 634540131 is about 25190.0800117824. The cubic root of 634540131 is about 859.3162633769.

Adding to 634540131 its reverse (131045436), we get a palindrome (765585567).

The spelling of 634540131 in words is "six hundred thirty-four million, five hundred forty thousand, one hundred thirty-one".