391496197 has 6 divisors (see below), whose sum is σ = 413186118. Its totient is φ = 370890792.

The previous prime is 391496191. The next prime is 391496221. The reversal of 391496197 is 791694193.

It can be written as a sum of positive squares in only one way, i.e., 336869316 + 54626881 = 18354^2 + 7391^2 .

It is not a de Polignac number, because 391496197 - 2¹¹ = 391494149 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 391496197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391496191) 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, 541878 + ... + 542599.

It is an arithmetic number, because the mean of its divisors is an integer number (68864353).

Almost surely, 2^391496197 is an apocalyptic number.

It is an amenable number.

391496197 is a deficient number, since it is larger than the sum of its proper divisors (21689921).

391496197 is a wasteful number, since it uses less digits than its factorization.

391496197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084515 (or 1084496 counting only the distinct ones).

The product of its digits is 367416, while the sum is 49.

The square root of 391496197 is about 19786.2628356140. The cubic root of 391496197 is about 731.5474754142.

The spelling of 391496197 in words is "three hundred ninety-one million, four hundred ninety-six thousand, one hundred ninety-seven".