139321617 has 4 divisors (see below), whose sum is σ = 185762160. Its totient is φ = 92881076.

The previous prime is 139321601. The next prime is 139321619. The reversal of 139321617 is 716123931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716123931 = 3 ⋅238707977.

It is a cyclic number.

It is not a de Polignac number, because 139321617 - 2⁴ = 139321601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139321619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23220267 + ... + 23220272.

It is an arithmetic number, because the mean of its divisors is an integer number (46440540).

Almost surely, 2^139321617 is an apocalyptic number.

It is an amenable number.

139321617 is a deficient number, since it is larger than the sum of its proper divisors (46440543).

139321617 is an equidigital number, since it uses as much as digits as its factorization.

139321617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46440542.

The product of its digits is 6804, while the sum is 33.

The square root of 139321617 is about 11803.4578408194. The cubic root of 139321617 is about 518.4093614648.

The spelling of 139321617 in words is "one hundred thirty-nine million, three hundred twenty-one thousand, six hundred seventeen".