2131921539 has 20 divisors (see below), whose sum is σ = 3474243960. Its totient is φ = 1292073120.

The previous prime is 2131921523. The next prime is 2131921541. The reversal of 2131921539 is 9351291312.

2131921539 is a `hidden beast` number, since 2 + 1 + 31 + 92 + 1 + 539 = 666.

It is not a de Polignac number, because 2131921539 - 2⁴ = 2131921523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2131921579) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1195474 + ... + 1197255.

It is an arithmetic number, because the mean of its divisors is an integer number (173712198).

Almost surely, 2^2131921539 is an apocalyptic number.

2131921539 is a deficient number, since it is larger than the sum of its proper divisors (1342322421).

2131921539 is a wasteful number, since it uses less digits than its factorization.

2131921539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392752 (or 2392743 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 2131921539 is about 46172.7358838525. The cubic root of 2131921539 is about 1287.0351433832.

The spelling of 2131921539 in words is "two billion, one hundred thirty-one million, nine hundred twenty-one thousand, five hundred thirty-nine".