1312023091 has 2 divisors, whose sum is σ = 1312023092. Its totient is φ = 1312023090.

The previous prime is 1312023077. The next prime is 1312023101. The reversal of 1312023091 is 1903202131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312023091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312023491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656011545 + 656011546.

It is an arithmetic number, because the mean of its divisors is an integer number (656011546).

Almost surely, 2^1312023091 is an apocalyptic number.

1312023091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312023091 is an equidigital number, since it uses as much as digits as its factorization.

1312023091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1312023091 is about 36221.8592979433. The cubic root of 1312023091 is about 1094.7471573454.

The spelling of 1312023091 in words is "one billion, three hundred twelve million, twenty-three thousand, ninety-one".