391315613 has 6 divisors (see below), whose sum is σ = 423732474. Its totient is φ = 361214256.

The previous prime is 391315543. The next prime is 391315619. The reversal of 391315613 is 316513193.

It can be written as a sum of positive squares in 3 ways, for example, as 36445369 + 354870244 = 6037^2 + 18838^2 .

It is not a de Polignac number, because 391315613 - 2²⁶ = 324206749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391315613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391315619) 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 5 ways as a sum of consecutive naturals, for example, 1157570 + ... + 1157907.

It is an arithmetic number, because the mean of its divisors is an integer number (70622079).

Almost surely, 2^391315613 is an apocalyptic number.

It is an amenable number.

391315613 is a deficient number, since it is larger than the sum of its proper divisors (32416861).

391315613 is a wasteful number, since it uses less digits than its factorization.

391315613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315503 (or 2315490 counting only the distinct ones).

The product of its digits is 7290, while the sum is 32.

The square root of 391315613 is about 19781.6989411931. The cubic root of 391315613 is about 731.4349787178.

It can be divided in two parts, 39131 and 5613, that added together give a palindrome (44744).

The spelling of 391315613 in words is "three hundred ninety-one million, three hundred fifteen thousand, six hundred thirteen".