1313211791 has 2 divisors, whose sum is σ = 1313211792. Its totient is φ = 1313211790.

The previous prime is 1313211773. The next prime is 1313211803. The reversal of 1313211791 is 1971123131.

It is a strong prime.

It is an emirp because it is prime and its reverse (1971123131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1313211791 - 2²⁶ = 1246102927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313211751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656605895 + 656605896.

It is an arithmetic number, because the mean of its divisors is an integer number (656605896).

Almost surely, 2^1313211791 is an apocalyptic number.

1313211791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313211791 is an equidigital number, since it uses as much as digits as its factorization.

1313211791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 29.

The square root of 1313211791 is about 36238.2641830428. The cubic root of 1313211791 is about 1095.0776731596.

The spelling of 1313211791 in words is "one billion, three hundred thirteen million, two hundred eleven thousand, seven hundred ninety-one".