139517691 has 8 divisors (see below), whose sum is σ = 196966224. Its totient is φ = 87540480.

The previous prime is 139517689. The next prime is 139517699. The reversal of 139517691 is 196715931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139517691 - 2¹ = 139517689 is a prime.

It is a super-2 number, since 2×139517691² = 38930372203942962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139517699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367770 + ... + 1367871.

It is an arithmetic number, because the mean of its divisors is an integer number (24620778).

Almost surely, 2^139517691 is an apocalyptic number.

139517691 is a deficient number, since it is larger than the sum of its proper divisors (57448533).

139517691 is a wasteful number, since it uses less digits than its factorization.

139517691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735661.

The product of its digits is 51030, while the sum is 42.

The square root of 139517691 is about 11811.7607070242. The cubic root of 139517691 is about 518.6524415949.

The spelling of 139517691 in words is "one hundred thirty-nine million, five hundred seventeen thousand, six hundred ninety-one".