2131979851 has 2 divisors, whose sum is σ = 2131979852. Its totient is φ = 2131979850.

The previous prime is 2131979821. The next prime is 2131979879. The reversal of 2131979851 is 1589791312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2131979851 - 2¹⁷ = 2131848779 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131979821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065989925 + 1065989926.

It is an arithmetic number, because the mean of its divisors is an integer number (1065989926).

Almost surely, 2^2131979851 is an apocalyptic number.

2131979851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131979851 is an equidigital number, since it uses as much as digits as its factorization.

2131979851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 2131979851 is about 46173.3673344278. The cubic root of 2131979851 is about 1287.0468775406.

The spelling of 2131979851 in words is "two billion, one hundred thirty-one million, nine hundred seventy-nine thousand, eight hundred fifty-one".