320291497 has 4 divisors (see below), whose sum is σ = 320594436. Its totient is φ = 319988560.

The previous prime is 320291453. The next prime is 320291507. The reversal of 320291497 is 794192023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 794192023 = 19013 ⋅41771.

It can be written as a sum of positive squares in 2 ways, for example, as 68244121 + 252047376 = 8261^2 + 15876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320291497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320291197) 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 3 ways as a sum of consecutive naturals, for example, 149878 + ... + 151999.

It is an arithmetic number, because the mean of its divisors is an integer number (80148609).

Almost surely, 2^320291497 is an apocalyptic number.

It is an amenable number.

320291497 is a deficient number, since it is larger than the sum of its proper divisors (302939).

320291497 is a wasteful number, since it uses less digits than its factorization.

320291497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302938.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 320291497 is about 17896.6895542164. The cubic root of 320291497 is about 684.1980043305.

The spelling of 320291497 in words is "three hundred twenty million, two hundred ninety-one thousand, four hundred ninety-seven".