188541631 has 2 divisors, whose sum is σ = 188541632. Its totient is φ = 188541630.

The previous prime is 188541629. The next prime is 188541643. The reversal of 188541631 is 136145881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 188541631 - 2¹ = 188541629 is a prime.

It is a super-2 number, since 2×188541631² = 71095893240280322, which contains 22 as substring.

Together with 188541629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188541931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94270815 + 94270816.

It is an arithmetic number, because the mean of its divisors is an integer number (94270816).

Almost surely, 2^188541631 is an apocalyptic number.

188541631 is a deficient number, since it is larger than the sum of its proper divisors (1).

188541631 is an equidigital number, since it uses as much as digits as its factorization.

188541631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 37.

The square root of 188541631 is about 13731.0462456435. The cubic root of 188541631 is about 573.4150489335.

The spelling of 188541631 in words is "one hundred eighty-eight million, five hundred forty-one thousand, six hundred thirty-one".