187115393 has 2 divisors, whose sum is σ = 187115394. Its totient is φ = 187115392.

The previous prime is 187115377. The next prime is 187115399. The reversal of 187115393 is 393511781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176172529 + 10942864 = 13273^2 + 3308^2 .

It is a cyclic number.

It is not a de Polignac number, because 187115393 - 2⁴ = 187115377 is a prime.

It is not a weakly prime, because it can be changed into another prime (187115399) 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, 93557696 + 93557697.

It is an arithmetic number, because the mean of its divisors is an integer number (93557697).

Almost surely, 2^187115393 is an apocalyptic number.

It is an amenable number.

187115393 is a deficient number, since it is larger than the sum of its proper divisors (1).

187115393 is an equidigital number, since it uses as much as digits as its factorization.

187115393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 187115393 is about 13679.0128664316. The cubic root of 187115393 is about 571.9655066246.

The spelling of 187115393 in words is "one hundred eighty-seven million, one hundred fifteen thousand, three hundred ninety-three".