139515023 has 2 divisors, whose sum is σ = 139515024. Its totient is φ = 139515022.

The previous prime is 139515017. The next prime is 139515059. The reversal of 139515023 is 320515931.

It is a weak prime.

It is an emirp because it is prime and its reverse (320515931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139515023 - 2¹⁰ = 139513999 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139515083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69757511 + 69757512.

It is an arithmetic number, because the mean of its divisors is an integer number (69757512).

Almost surely, 2^139515023 is an apocalyptic number.

139515023 is a deficient number, since it is larger than the sum of its proper divisors (1).

139515023 is an equidigital number, since it uses as much as digits as its factorization.

139515023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 139515023 is about 11811.6477681990. The cubic root of 139515023 is about 518.6491355063.

The spelling of 139515023 in words is "one hundred thirty-nine million, five hundred fifteen thousand, twenty-three".