391096985 has 8 divisors (see below), whose sum is σ = 496923336. Its totient is φ = 294472960.

The previous prime is 391096967. The next prime is 391097009. The reversal of 391096985 is 589690193.

It can be written as a sum of positive squares in 4 ways, for example, as 15241216 + 375855769 = 3904^2 + 19387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 391096985 - 2¹⁶ = 391031449 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 2300486 + ... + 2300655.

It is an arithmetic number, because the mean of its divisors is an integer number (62115417).

Almost surely, 2^391096985 is an apocalyptic number.

It is an amenable number.

391096985 is a deficient number, since it is larger than the sum of its proper divisors (105826351).

391096985 is a wasteful number, since it uses less digits than its factorization.

391096985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601163.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 391096985 is about 19776.1721523656. The cubic root of 391096985 is about 731.2987357880.

The spelling of 391096985 in words is "three hundred ninety-one million, ninety-six thousand, nine hundred eighty-five".