102023011991 has 2 divisors, whose sum is σ = 102023011992. Its totient is φ = 102023011990.

The previous prime is 102023011963. The next prime is 102023012029. The reversal of 102023011991 is 199110320201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102023011991 - 2⁶ = 102023011927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102023011091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51011505995 + 51011505996.

It is an arithmetic number, because the mean of its divisors is an integer number (51011505996).

Almost surely, 2^102023011991 is an apocalyptic number.

102023011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102023011991 is an equidigital number, since it uses as much as digits as its factorization.

102023011991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 102023011991 in words is "one hundred two billion, twenty-three million, eleven thousand, nine hundred ninety-one".