188947081 has 4 divisors (see below), whose sum is σ = 189008964. Its totient is φ = 188885200.

The previous prime is 188947051. The next prime is 188947103. The reversal of 188947081 is 180749881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74649600 + 114297481 = 8640^2 + 10691^2 .

It is a cyclic number.

It is not a de Polignac number, because 188947081 - 2²³ = 180558473 is a prime.

It is a super-2 number, since 2×188947081² = 71401998836841122, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 188947081 parts by 19439 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188947021) 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, 26110 + ... + 32551.

It is an arithmetic number, because the mean of its divisors is an integer number (47252241).

Almost surely, 2^188947081 is an apocalyptic number.

It is an amenable number.

188947081 is a deficient number, since it is larger than the sum of its proper divisors (61883).

188947081 is an equidigital number, since it uses as much as digits as its factorization.

188947081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61882.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 188947081 is about 13745.8023047038. The cubic root of 188947081 is about 573.8257887710.

The spelling of 188947081 in words is "one hundred eighty-eight million, nine hundred forty-seven thousand, eighty-one".