2131979 has 2 divisors, whose sum is σ = 2131980. Its totient is φ = 2131978.

The previous prime is 2131951. The next prime is 2131981. The reversal of 2131979 is 9791312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2131979 - 2¹² = 2127883 is a prime.

Together with 2131981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2130979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065989 + 1065990.

It is an arithmetic number, because the mean of its divisors is an integer number (1065990).

2^2131979 is an apocalyptic number.

2131979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131979 is an equidigital number, since it uses as much as digits as its factorization.

2131979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 32.

The square root of 2131979 is about 1460.1297887517. The cubic root of 2131979 is about 128.7046706295.

The spelling of 2131979 in words is "two million, one hundred thirty-one thousand, nine hundred seventy-nine".