391313231242 has 24 divisors (see below), whose sum is σ = 619378234956. Its totient is φ = 185345457024.

The previous prime is 391313231233. The next prime is 391313231261. The reversal of 391313231242 is 242132313193.

It can be written as a sum of positive squares in 6 ways, for example, as 160825862961 + 230487368281 = 401031^2 + 480091^2 .

It is a junction number, because it is equal to n+sod(n) for n = 391313231198 and 391313231207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2105643 + ... + 2283934.

Almost surely, 2^391313231242 is an apocalyptic number.

391313231242 is a deficient number, since it is larger than the sum of its proper divisors (228065003714).

391313231242 is a wasteful number, since it uses less digits than its factorization.

391313231242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389690 (or 4389661 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The spelling of 391313231242 in words is "three hundred ninety-one billion, three hundred thirteen million, two hundred thirty-one thousand, two hundred forty-two".