188535881 has 2 divisors, whose sum is σ = 188535882. Its totient is φ = 188535880.

The previous prime is 188535871. The next prime is 188535887.

188535881 is nontrivially palindromic in base 10.

188535881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184960000 + 3575881 = 13600^2 + 1891^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 188535881 - 2⁶ = 188535817 is a prime.

It is a super-2 number, since 2×188535881² = 71091556848892322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188535887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94267940 + 94267941.

It is an arithmetic number, because the mean of its divisors is an integer number (94267941).

Almost surely, 2^188535881 is an apocalyptic number.

It is an amenable number.

188535881 is a deficient number, since it is larger than the sum of its proper divisors (1).

188535881 is an equidigital number, since it uses as much as digits as its factorization.

188535881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 307200, while the sum is 47.

The square root of 188535881 is about 13730.8368645178. The cubic root of 188535881 is about 573.4092196815.

The spelling of 188535881 in words is "one hundred eighty-eight million, five hundred thirty-five thousand, eight hundred eighty-one".