131021649 has 24 divisors (see below), whose sum is σ = 209550432. Its totient is φ = 78217920.

The previous prime is 131021633. The next prime is 131021707. The reversal of 131021649 is 946120131.

131021649 is a `hidden beast` number, since 1 + 3 + 10 + 2 + 1 + 649 = 666.

It is not a de Polignac number, because 131021649 - 2⁴ = 131021633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131021629) 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 23 ways as a sum of consecutive naturals, for example, 3244 + ... + 16509.

It is an arithmetic number, because the mean of its divisors is an integer number (8731268).

Almost surely, 2^131021649 is an apocalyptic number.

It is an amenable number.

131021649 is a deficient number, since it is larger than the sum of its proper divisors (78528783).

131021649 is a wasteful number, since it uses less digits than its factorization.

131021649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19837 (or 19834 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 131021649 is about 11446.4688441458. The cubic root of 131021649 is about 507.9032833525.

The spelling of 131021649 in words is "one hundred thirty-one million, twenty-one thousand, six hundred forty-nine".