391074613 has 4 divisors (see below), whose sum is σ = 414079020. Its totient is φ = 368070208.

The previous prime is 391074611. The next prime is 391074661. The reversal of 391074613 is 316470193.

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 137405284 + 253669329 = 11722^2 + 15927^2 .

It is a cyclic number.

It is not a de Polignac number, because 391074613 - 2¹ = 391074611 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 (391074611) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11502178 + ... + 11502211.

It is an arithmetic number, because the mean of its divisors is an integer number (103519755).

Almost surely, 2^391074613 is an apocalyptic number.

It is an amenable number.

391074613 is a deficient number, since it is larger than the sum of its proper divisors (23004407).

391074613 is a wasteful number, since it uses less digits than its factorization.

391074613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23004406.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 391074613 is about 19775.6065140870. The cubic root of 391074613 is about 731.2847913123.

The spelling of 391074613 in words is "three hundred ninety-one million, seventy-four thousand, six hundred thirteen".