1659979931 has 2 divisors, whose sum is σ = 1659979932. Its totient is φ = 1659979930.

The previous prime is 1659979907. The next prime is 1659979933. The reversal of 1659979931 is 1399799561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1659979931 - 2²⁶ = 1592871067 is a prime.

It is a super-2 number, since 2×1659979931² = 5511066742645529522, which contains 22 as substring.

Together with 1659979933, 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 (1659979933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829989965 + 829989966.

It is an arithmetic number, because the mean of its divisors is an integer number (829989966).

Almost surely, 2^1659979931 is an apocalyptic number.

1659979931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659979931 is an equidigital number, since it uses as much as digits as its factorization.

1659979931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4133430, while the sum is 59.

The square root of 1659979931 is about 40742.8512870663. The cubic root of 1659979931 is about 1184.0433759047.

The spelling of 1659979931 in words is "one billion, six hundred fifty-nine million, nine hundred seventy-nine thousand, nine hundred thirty-one".