1313223991 has 2 divisors, whose sum is σ = 1313223992. Its totient is φ = 1313223990.

The previous prime is 1313223911. The next prime is 1313224001. The reversal of 1313223991 is 1993223131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1313223991 - 2²⁹ = 776353079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313223911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656611995 + 656611996.

It is an arithmetic number, because the mean of its divisors is an integer number (656611996).

Almost surely, 2^1313223991 is an apocalyptic number.

1313223991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313223991 is an equidigital number, since it uses as much as digits as its factorization.

1313223991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 1313223991 is about 36238.4325130103. The cubic root of 1313223991 is about 1095.0810643126.

The spelling of 1313223991 in words is "one billion, three hundred thirteen million, two hundred twenty-three thousand, nine hundred ninety-one".