190748821923991 has 2 divisors, whose sum is σ = 190748821923992. Its totient is φ = 190748821923990.

The previous prime is 190748821923889. The next prime is 190748821924007. The reversal of 190748821923991 is 199329128847091.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190748821923991 is a prime.

It is a super-2 number, since 2×190748821923991² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190748821920991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95374410961995 + 95374410961996.

It is an arithmetic number, because the mean of its divisors is an integer number (95374410961996).

Almost surely, 2^{190748821923991} is an apocalyptic number.

190748821923991 is a deficient number, since it is larger than the sum of its proper divisors (1).

190748821923991 is an equidigital number, since it uses as much as digits as its factorization.

190748821923991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141087744, while the sum is 73.

The spelling of 190748821923991 in words is "one hundred ninety trillion, seven hundred forty-eight billion, eight hundred twenty-one million, nine hundred twenty-three thousand, nine hundred ninety-one".