139173497 has 4 divisors (see below), whose sum is σ = 140524800. Its totient is φ = 137822196.

The previous prime is 139173491. The next prime is 139173521. The reversal of 139173497 is 794371931.

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.

It is a cyclic number.

It is not a de Polignac number, because 139173497 - 2⁴ = 139173481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139173491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675497 + ... + 675702.

It is an arithmetic number, because the mean of its divisors is an integer number (35131200).

Almost surely, 2^139173497 is an apocalyptic number.

It is an amenable number.

139173497 is a deficient number, since it is larger than the sum of its proper divisors (1351303).

139173497 is a wasteful number, since it uses less digits than its factorization.

139173497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351302.

The product of its digits is 142884, while the sum is 44.

The square root of 139173497 is about 11797.1817397207. The cubic root of 139173497 is about 518.2255804064.

The spelling of 139173497 in words is "one hundred thirty-nine million, one hundred seventy-three thousand, four hundred ninety-seven".