648139131 has 32 divisors (see below), whose sum is σ = 982368000. Its totient is φ = 422210304.

The previous prime is 648139117. The next prime is 648139169. The reversal of 648139131 is 131931846.

648139131 is a `hidden beast` number, since 648 + 1 + 3 + 9 + 1 + 3 + 1 = 666.

It is not a de Polignac number, because 648139131 - 2¹³ = 648130939 is a prime.

It is a super-2 number, since 2×648139131² = 840168666266870322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648139171) 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, 284011 + ... + 286283.

It is an arithmetic number, because the mean of its divisors is an integer number (30699000).

Almost surely, 2^648139131 is an apocalyptic number.

648139131 is a deficient number, since it is larger than the sum of its proper divisors (334228869).

648139131 is a wasteful number, since it uses less digits than its factorization.

648139131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520 (or 2514 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 648139131 is about 25458.5767669758. The cubic root of 648139131 is about 865.4116703528.

The spelling of 648139131 in words is "six hundred forty-eight million, one hundred thirty-nine thousand, one hundred thirty-one".