188139401 has 2 divisors, whose sum is σ = 188139402. Its totient is φ = 188139400.

The previous prime is 188139389. The next prime is 188139409. The reversal of 188139401 is 104931881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133379401 + 54760000 = 11549^2 + 7400^2 .

It is an emirp because it is prime and its reverse (104931881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188139401 - 2¹⁸ = 187877257 is a prime.

It is equal to p_10457909 and since 188139401 and 10457909 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (188139409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94069700 + 94069701.

It is an arithmetic number, because the mean of its divisors is an integer number (94069701).

Almost surely, 2^188139401 is an apocalyptic number.

It is an amenable number.

188139401 is a deficient number, since it is larger than the sum of its proper divisors (1).

188139401 is an equidigital number, since it uses as much as digits as its factorization.

188139401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 188139401 is about 13716.3916902369. The cubic root of 188139401 is about 573.0069888395.

The spelling of 188139401 in words is "one hundred eighty-eight million, one hundred thirty-nine thousand, four hundred one".