320494637 has 2 divisors, whose sum is σ = 320494638. Its totient is φ = 320494636.

The previous prime is 320494633. The next prime is 320494651. The reversal of 320494637 is 736494023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271788196 + 48706441 = 16486^2 + 6979^2 .

It is a cyclic number.

It is not a de Polignac number, because 320494637 - 2² = 320494633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320494637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320494633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160247318 + 160247319.

It is an arithmetic number, because the mean of its divisors is an integer number (160247319).

Almost surely, 2^320494637 is an apocalyptic number.

It is an amenable number.

320494637 is a deficient number, since it is larger than the sum of its proper divisors (1).

320494637 is an equidigital number, since it uses as much as digits as its factorization.

320494637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 38.

The square root of 320494637 is about 17902.3640059072. The cubic root of 320494637 is about 684.3426211463.

The spelling of 320494637 in words is "three hundred twenty million, four hundred ninety-four thousand, six hundred thirty-seven".