138158179 has 2 divisors, whose sum is σ = 138158180. Its totient is φ = 138158178.

The previous prime is 138158173. The next prime is 138158197. The reversal of 138158179 is 971851831.

Together with next prime (138158197) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138158179 - 2¹³ = 138149987 is a prime.

It is not a weakly prime, because it can be changed into another prime (138158173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69079089 + 69079090.

It is an arithmetic number, because the mean of its divisors is an integer number (69079090).

Almost surely, 2^138158179 is an apocalyptic number.

138158179 is a deficient number, since it is larger than the sum of its proper divisors (1).

138158179 is an equidigital number, since it uses as much as digits as its factorization.

138158179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 43.

The square root of 138158179 is about 11754.0707416622. The cubic root of 138158179 is about 516.9622927428.

The spelling of 138158179 in words is "one hundred thirty-eight million, one hundred fifty-eight thousand, one hundred seventy-nine".