139185313 has 4 divisors (see below), whose sum is σ = 139339008. Its totient is φ = 139031620.

The previous prime is 139185311. The next prime is 139185337. The reversal of 139185313 is 313581931.

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 139185313 - 2¹ = 139185311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139185311) 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, 75481 + ... + 77302.

It is an arithmetic number, because the mean of its divisors is an integer number (34834752).

Almost surely, 2^139185313 is an apocalyptic number.

It is an amenable number.

139185313 is a deficient number, since it is larger than the sum of its proper divisors (153695).

139185313 is an equidigital number, since it uses as much as digits as its factorization.

139185313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153694.

The product of its digits is 9720, while the sum is 34.

The square root of 139185313 is about 11797.6825266660. The cubic root of 139185313 is about 518.2402459864.

The spelling of 139185313 in words is "one hundred thirty-nine million, one hundred eighty-five thousand, three hundred thirteen".