188000988991 has 2 divisors, whose sum is σ = 188000988992. Its totient is φ = 188000988990.

The previous prime is 188000988979. The next prime is 188000988997. The reversal of 188000988991 is 199889000881.

It is a strong prime.

It is an emirp because it is prime and its reverse (199889000881) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 166886000881 and 188000688661.

It is a cyclic number.

It is not a de Polignac number, because 188000988991 - 2⁷ = 188000988863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188000988997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94000494495 + 94000494496.

It is an arithmetic number, because the mean of its divisors is an integer number (94000494496).

Almost surely, 2^188000988991 is an apocalyptic number.

188000988991 is a deficient number, since it is larger than the sum of its proper divisors (1).

188000988991 is an equidigital number, since it uses as much as digits as its factorization.

188000988991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 61.

The spelling of 188000988991 in words is "one hundred eighty-eight billion, nine hundred eighty-eight thousand, nine hundred ninety-one".