320816651 has 2 divisors, whose sum is σ = 320816652. Its totient is φ = 320816650.

The previous prime is 320816623. The next prime is 320816669. The reversal of 320816651 is 156618023.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (156618023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320816651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320816621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160408325 + 160408326.

It is an arithmetic number, because the mean of its divisors is an integer number (160408326).

Almost surely, 2^320816651 is an apocalyptic number.

320816651 is a deficient number, since it is larger than the sum of its proper divisors (1).

320816651 is an equidigital number, since it uses as much as digits as its factorization.

320816651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 320816651 is about 17911.3553646842. The cubic root of 320816651 is about 684.5717400522.

The spelling of 320816651 in words is "three hundred twenty million, eight hundred sixteen thousand, six hundred fifty-one".