391605413 has 4 divisors (see below), whose sum is σ = 392038080. Its totient is φ = 391172748.

The previous prime is 391605407. The next prime is 391605433. The reversal of 391605413 is 314506193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391605413 - 2¹² = 391601317 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 391605413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391605433) 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, 214973 + ... + 216786.

It is an arithmetic number, because the mean of its divisors is an integer number (98009520).

Almost surely, 2^391605413 is an apocalyptic number.

It is an amenable number.

391605413 is a deficient number, since it is larger than the sum of its proper divisors (432667).

391605413 is an equidigital number, since it uses as much as digits as its factorization.

391605413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432666.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 391605413 is about 19789.0225377607. The cubic root of 391605413 is about 731.6154958797.

The spelling of 391605413 in words is "three hundred ninety-one million, six hundred five thousand, four hundred thirteen".