1311593947 has 2 divisors, whose sum is σ = 1311593948. Its totient is φ = 1311593946.

The previous prime is 1311593923. The next prime is 1311593953. The reversal of 1311593947 is 7493951131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311593947 - 2⁷ = 1311593819 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311593917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655796973 + 655796974.

It is an arithmetic number, because the mean of its divisors is an integer number (655796974).

Almost surely, 2^1311593947 is an apocalyptic number.

1311593947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311593947 is an equidigital number, since it uses as much as digits as its factorization.

1311593947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 43.

The square root of 1311593947 is about 36215.9349872401. The cubic root of 1311593947 is about 1094.6277856136.

The spelling of 1311593947 in words is "one billion, three hundred eleven million, five hundred ninety-three thousand, nine hundred forty-seven".