139657013 has 4 divisors (see below), whose sum is σ = 140938380. Its totient is φ = 138375648.

The previous prime is 139657003. The next prime is 139657019. The reversal of 139657013 is 310756931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75047569 + 64609444 = 8663^2 + 8038^2 .

It is a cyclic number.

It is not a de Polignac number, because 139657013 - 2⁴ = 139656997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139657019) 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, 640520 + ... + 640737.

It is an arithmetic number, because the mean of its divisors is an integer number (35234595).

Almost surely, 2^139657013 is an apocalyptic number.

It is an amenable number.

139657013 is a deficient number, since it is larger than the sum of its proper divisors (1281367).

139657013 is a wasteful number, since it uses less digits than its factorization.

139657013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281366.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 139657013 is about 11817.6568320459. The cubic root of 139657013 is about 518.8250258158.

The spelling of 139657013 in words is "one hundred thirty-nine million, six hundred fifty-seven thousand, thirteen".