139591297 has 8 divisors (see below), whose sum is σ = 145011240. Its totient is φ = 134211840.

The previous prime is 139591289. The next prime is 139591321. The reversal of 139591297 is 792195931.

It can be written as a sum of positive squares in 4 ways, for example, as 29257281 + 110334016 = 5409^2 + 10504^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 139591297 - 2³ = 139591289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139591247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2998 + ... + 16975.

It is an arithmetic number, because the mean of its divisors is an integer number (18126405).

Almost surely, 2^139591297 is an apocalyptic number.

It is an amenable number.

139591297 is a deficient number, since it is larger than the sum of its proper divisors (5419943).

139591297 is a wasteful number, since it uses less digits than its factorization.

139591297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20243.

The product of its digits is 153090, while the sum is 46.

The square root of 139591297 is about 11814.8760890667. The cubic root of 139591297 is about 518.7436348568.

The spelling of 139591297 in words is "one hundred thirty-nine million, five hundred ninety-one thousand, two hundred ninety-seven".