320137613 has 4 divisors (see below), whose sum is σ = 320452188. Its totient is φ = 319823040.

The previous prime is 320137603. The next prime is 320137619. The reversal of 320137613 is 316731023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 316731023 = 7 ⋅45247289.

It can be written as a sum of positive squares in 2 ways, for example, as 244046884 + 76090729 = 15622^2 + 8723^2 .

It is a cyclic number.

It is not a de Polignac number, because 320137613 - 2²⁰ = 319089037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320137619) 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, 155756 + ... + 157797.

It is an arithmetic number, because the mean of its divisors is an integer number (80113047).

Almost surely, 2^320137613 is an apocalyptic number.

It is an amenable number.

320137613 is a deficient number, since it is larger than the sum of its proper divisors (314575).

320137613 is a wasteful number, since it uses less digits than its factorization.

320137613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314574.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 320137613 is about 17892.3898068425. The cubic root of 320137613 is about 684.0884125025.

Adding to 320137613 its reverse (316731023), we get a palindrome (636868636).

The spelling of 320137613 in words is "three hundred twenty million, one hundred thirty-seven thousand, six hundred thirteen".