188899901 has 2 divisors, whose sum is σ = 188899902. Its totient is φ = 188899900.

The previous prime is 188899891. The next prime is 188899967. The reversal of 188899901 is 109998881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150087001 + 38812900 = 12251^2 + 6230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188899901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188899201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94449950 + 94449951.

It is an arithmetic number, because the mean of its divisors is an integer number (94449951).

Almost surely, 2^188899901 is an apocalyptic number.

It is an amenable number.

188899901 is a deficient number, since it is larger than the sum of its proper divisors (1).

188899901 is an equidigital number, since it uses as much as digits as its factorization.

188899901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 53.

The square root of 188899901 is about 13744.0860372744. The cubic root of 188899901 is about 573.7780234492.

The spelling of 188899901 in words is "one hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred one".