1331311979 has 2 divisors, whose sum is σ = 1331311980. Its totient is φ = 1331311978.

The previous prime is 1331311937. The next prime is 1331311987. The reversal of 1331311979 is 9791131331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331311979 - 2¹⁶ = 1331246443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331361979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665655989 + 665655990.

It is an arithmetic number, because the mean of its divisors is an integer number (665655990).

Almost surely, 2^1331311979 is an apocalyptic number.

1331311979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331311979 is an equidigital number, since it uses as much as digits as its factorization.

1331311979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 38.

The square root of 1331311979 is about 36487.1481346515. The cubic root of 1331311979 is about 1100.0859379140.

The spelling of 1331311979 in words is "one billion, three hundred thirty-one million, three hundred eleven thousand, nine hundred seventy-nine".