188745881 has 2 divisors, whose sum is σ = 188745882. Its totient is φ = 188745880.

The previous prime is 188745863. The next prime is 188745913. The reversal of 188745881 is 188547881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180096400 + 8649481 = 13420^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 188745881 - 2²⁶ = 121637017 is a prime.

It is a super-2 number, since 2×188745881² = 71250015188932322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188745811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94372940 + 94372941.

It is an arithmetic number, because the mean of its divisors is an integer number (94372941).

Almost surely, 2^188745881 is an apocalyptic number.

It is an amenable number.

188745881 is a deficient number, since it is larger than the sum of its proper divisors (1).

188745881 is an equidigital number, since it uses as much as digits as its factorization.

188745881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 573440, while the sum is 50.

The square root of 188745881 is about 13738.4817574578. The cubic root of 188745881 is about 573.6220372716.

The spelling of 188745881 in words is "one hundred eighty-eight million, seven hundred forty-five thousand, eight hundred eighty-one".