99991311023 has 2 divisors, whose sum is σ = 99991311024. Its totient is φ = 99991311022.

The previous prime is 99991311011. The next prime is 99991311031. The reversal of 99991311023 is 32011319999.

It is a strong prime.

It is an emirp because it is prime and its reverse (32011319999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99991311023 - 2⁸ = 99991310767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99991314023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995655511 + 49995655512.

It is an arithmetic number, because the mean of its divisors is an integer number (49995655512).

Almost surely, 2^99991311023 is an apocalyptic number.

99991311023 is a deficient number, since it is larger than the sum of its proper divisors (1).

99991311023 is an equidigital number, since it uses as much as digits as its factorization.

99991311023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 47.

The spelling of 99991311023 in words is "ninety-nine billion, nine hundred ninety-one million, three hundred eleven thousand, twenty-three".