188120081 has 4 divisors (see below), whose sum is σ = 190386672. Its totient is φ = 185853492.

The previous prime is 188120057. The next prime is 188120089. The reversal of 188120081 is 180021881.

188120081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 188120081 - 2¹⁸ = 187857937 is a prime.

It is a super-2 number, since 2×188120081² = 70778329750893122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188120089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1133171 + ... + 1133336.

It is an arithmetic number, because the mean of its divisors is an integer number (47596668).

Almost surely, 2^188120081 is an apocalyptic number.

It is an amenable number.

188120081 is a deficient number, since it is larger than the sum of its proper divisors (2266591).

188120081 is an equidigital number, since it uses as much as digits as its factorization.

188120081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266590.

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 188120081 is about 13715.6874053035. The cubic root of 188120081 is about 572.9873741745.

The spelling of 188120081 in words is "one hundred eighty-eight million, one hundred twenty thousand, eighty-one".