131390649 has 12 divisors (see below), whose sum is σ = 204385636. Its totient is φ = 80855712.

The previous prime is 131390639. The next prime is 131390689. The reversal of 131390649 is 946093131.

131390649 is a `hidden beast` number, since 1 + 3 + 1 + 3 + 9 + 0 + 649 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21455424 + 109935225 = 4632^2 + 10485^2 .

It is not a de Polignac number, because 131390649 - 2¹¹ = 131388601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131390639) 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 11 ways as a sum of consecutive naturals, for example, 561382 + ... + 561615.

Almost surely, 2^131390649 is an apocalyptic number.

It is an amenable number.

131390649 is a deficient number, since it is larger than the sum of its proper divisors (72994987).

131390649 is a wasteful number, since it uses less digits than its factorization.

131390649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123016 (or 1123013 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 131390649 is about 11462.5760193771. The cubic root of 131390649 is about 508.3796439280.

The spelling of 131390649 in words is "one hundred thirty-one million, three hundred ninety thousand, six hundred forty-nine".