139618517 has 16 divisors (see below), whose sum is σ = 149913600. Its totient is φ = 129645360.

The previous prime is 139618471. The next prime is 139618519. The reversal of 139618517 is 715816931.

It is not a de Polignac number, because 139618517 - 2⁸ = 139618261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139618519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286448 + ... + 286934.

It is an arithmetic number, because the mean of its divisors is an integer number (9369600).

Almost surely, 2^139618517 is an apocalyptic number.

It is an amenable number.

139618517 is a deficient number, since it is larger than the sum of its proper divisors (10295083).

139618517 is a wasteful number, since it uses less digits than its factorization.

139618517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776.

The product of its digits is 45360, while the sum is 41.

The square root of 139618517 is about 11816.0279705153. The cubic root of 139618517 is about 518.7773506265. Note that the first 3 decimals are identical.

The spelling of 139618517 in words is "one hundred thirty-nine million, six hundred eighteen thousand, five hundred seventeen".