1313511931 has 2 divisors, whose sum is σ = 1313511932. Its totient is φ = 1313511930.

The previous prime is 1313511893. The next prime is 1313511949. The reversal of 1313511931 is 1391153131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1313511931 - 2¹³ = 1313503739 is a prime.

It is a super-2 number, since 2×1313511931² = 3450627185758697522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1313511931.

It is not a weakly prime, because it can be changed into another prime (1313511131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656755965 + 656755966.

It is an arithmetic number, because the mean of its divisors is an integer number (656755966).

Almost surely, 2^1313511931 is an apocalyptic number.

1313511931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313511931 is an equidigital number, since it uses as much as digits as its factorization.

1313511931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1215, while the sum is 28.

The square root of 1313511931 is about 36242.4051492171. The cubic root of 1313511931 is about 1095.1610949855.

The spelling of 1313511931 in words is "one billion, three hundred thirteen million, five hundred eleven thousand, nine hundred thirty-one".