186139997 has 2 divisors, whose sum is σ = 186139998. Its totient is φ = 186139996.

The previous prime is 186139973. The next prime is 186140099. The reversal of 186139997 is 799931681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136282276 + 49857721 = 11674^2 + 7061^2 .

It is a cyclic number.

It is not a de Polignac number, because 186139997 - 2⁸ = 186139741 is a prime.

It is a super-3 number, since 3×186139997³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186139907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93069998 + 93069999.

It is an arithmetic number, because the mean of its divisors is an integer number (93069999).

Almost surely, 2^186139997 is an apocalyptic number.

It is an amenable number.

186139997 is a deficient number, since it is larger than the sum of its proper divisors (1).

186139997 is an equidigital number, since it uses as much as digits as its factorization.

186139997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The square root of 186139997 is about 13643.3132706099. The cubic root of 186139997 is about 570.9699265335.

The spelling of 186139997 in words is "one hundred eighty-six million, one hundred thirty-nine thousand, nine hundred ninety-seven".