188139101 has 2 divisors, whose sum is σ = 188139102. Its totient is φ = 188139100.

The previous prime is 188139097. The next prime is 188139181. The reversal of 188139101 is 101931881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176916601 + 11222500 = 13301^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 188139101 - 2² = 188139097 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188139181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94069550 + 94069551.

It is an arithmetic number, because the mean of its divisors is an integer number (94069551).

Almost surely, 2^188139101 is an apocalyptic number.

It is an amenable number.

188139101 is a deficient number, since it is larger than the sum of its proper divisors (1).

188139101 is an equidigital number, since it uses as much as digits as its factorization.

188139101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 32.

The square root of 188139101 is about 13716.3807544119. The cubic root of 188139101 is about 573.0066842742.

The spelling of 188139101 in words is "one hundred eighty-eight million, one hundred thirty-nine thousand, one hundred one".