320742497 has 2 divisors, whose sum is σ = 320742498. Its totient is φ = 320742496.

The previous prime is 320742491. The next prime is 320742503. The reversal of 320742497 is 794247023.

It is a balanced prime because it is at equal distance from previous prime (320742491) and next prime (320742503).

It can be written as a sum of positive squares in only one way, i.e., 308915776 + 11826721 = 17576^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 320742497 - 2²⁰ = 319693921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320742497.

It is not a weakly prime, because it can be changed into another prime (320742491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160371248 + 160371249.

It is an arithmetic number, because the mean of its divisors is an integer number (160371249).

Almost surely, 2^320742497 is an apocalyptic number.

It is an amenable number.

320742497 is a deficient number, since it is larger than the sum of its proper divisors (1).

320742497 is an equidigital number, since it uses as much as digits as its factorization.

320742497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 320742497 is about 17909.2852174508. The cubic root of 320742497 is about 684.5189917048.

The spelling of 320742497 in words is "three hundred twenty million, seven hundred forty-two thousand, four hundred ninety-seven".