139516505 has 16 divisors (see below), whose sum is σ = 177102720. Its totient is φ = 105291648.

The previous prime is 139516499. The next prime is 139516513. The reversal of 139516505 is 505615931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 139516505 - 2²⁰ = 138467929 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86 + ... + 16704.

It is an arithmetic number, because the mean of its divisors is an integer number (11068920).

Almost surely, 2^139516505 is an apocalyptic number.

It is an amenable number.

139516505 is a deficient number, since it is larger than the sum of its proper divisors (37586215).

139516505 is a wasteful number, since it uses less digits than its factorization.

139516505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16720.

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 139516505 is about 11811.7105027172. The cubic root of 139516505 is about 518.6509719520.

The spelling of 139516505 in words is "one hundred thirty-nine million, five hundred sixteen thousand, five hundred five".