138231187 has 2 divisors, whose sum is σ = 138231188. Its totient is φ = 138231186.

The previous prime is 138231167. The next prime is 138231217. The reversal of 138231187 is 781132831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138231187 is a prime.

It is a super-2 number, since 2×138231187² = 38215722118857938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138231167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69115593 + 69115594.

It is an arithmetic number, because the mean of its divisors is an integer number (69115594).

Almost surely, 2^138231187 is an apocalyptic number.

138231187 is a deficient number, since it is larger than the sum of its proper divisors (1).

138231187 is an equidigital number, since it uses as much as digits as its factorization.

138231187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 138231187 is about 11757.1759789500. The cubic root of 138231187 is about 517.0533375079.

The spelling of 138231187 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, one hundred eighty-seven".