391291713 has 6 divisors (see below), whose sum is σ = 565199154. Its totient is φ = 260861136.

The previous prime is 391291651. The next prime is 391291727. The reversal of 391291713 is 317192193.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 325730304 + 65561409 = 18048^2 + 8097^2 .

It is not a de Polignac number, because 391291713 - 2¹⁶ = 391226177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391291913) 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, 21738420 + ... + 21738437.

It is an arithmetic number, because the mean of its divisors is an integer number (94199859).

Almost surely, 2^391291713 is an apocalyptic number.

It is an amenable number.

391291713 is a deficient number, since it is larger than the sum of its proper divisors (173907441).

391291713 is a wasteful number, since it uses less digits than its factorization.

391291713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43476863 (or 43476860 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 391291713 is about 19781.0948382540. The cubic root of 391291713 is about 731.4200873690.

The spelling of 391291713 in words is "three hundred ninety-one million, two hundred ninety-one thousand, seven hundred thirteen".