188820890491 has 2 divisors, whose sum is σ = 188820890492. Its totient is φ = 188820890490.

The previous prime is 188820890443. The next prime is 188820890509. The reversal of 188820890491 is 194098028881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188820890491 is a prime.

It is not a weakly prime, because it can be changed into another prime (188820890891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94410445245 + 94410445246.

It is an arithmetic number, because the mean of its divisors is an integer number (94410445246).

Almost surely, 2^188820890491 is an apocalyptic number.

188820890491 is a deficient number, since it is larger than the sum of its proper divisors (1).

188820890491 is an equidigital number, since it uses as much as digits as its factorization.

188820890491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2654208, while the sum is 58.

The spelling of 188820890491 in words is "one hundred eighty-eight billion, eight hundred twenty million, eight hundred ninety thousand, four hundred ninety-one".