139915123 has 2 divisors, whose sum is σ = 139915124. Its totient is φ = 139915122.

The previous prime is 139915091. The next prime is 139915129. The reversal of 139915123 is 321519931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139915123 - 2⁵ = 139915091 is a prime.

It is not a weakly prime, because it can be changed into another prime (139915129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69957561 + 69957562.

It is an arithmetic number, because the mean of its divisors is an integer number (69957562).

Almost surely, 2^139915123 is an apocalyptic number.

139915123 is a deficient number, since it is larger than the sum of its proper divisors (1).

139915123 is an equidigital number, since it uses as much as digits as its factorization.

139915123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 34.

The square root of 139915123 is about 11828.5723145272. The cubic root of 139915123 is about 519.1444548478.

The spelling of 139915123 in words is "one hundred thirty-nine million, nine hundred fifteen thousand, one hundred twenty-three".