320494687 has 2 divisors, whose sum is σ = 320494688. Its totient is φ = 320494686.

The previous prime is 320494661. The next prime is 320494711. The reversal of 320494687 is 786494023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320494687 - 2¹¹ = 320492639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320494637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160247343 + 160247344.

It is an arithmetic number, because the mean of its divisors is an integer number (160247344).

Almost surely, 2^320494687 is an apocalyptic number.

320494687 is a deficient number, since it is larger than the sum of its proper divisors (1).

320494687 is an equidigital number, since it uses as much as digits as its factorization.

320494687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 320494687 is about 17902.3654023707. The cubic root of 320494687 is about 684.3426567341.

The spelling of 320494687 in words is "three hundred twenty million, four hundred ninety-four thousand, six hundred eighty-seven".