320949857 has 2 divisors, whose sum is σ = 320949858. Its totient is φ = 320949856.

The previous prime is 320949833. The next prime is 320949943. The reversal of 320949857 is 758949023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200477281 + 120472576 = 14159^2 + 10976^2 .

It is a cyclic number.

It is not a de Polignac number, because 320949857 - 2²² = 316755553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320949257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160474928 + 160474929.

It is an arithmetic number, because the mean of its divisors is an integer number (160474929).

Almost surely, 2^320949857 is an apocalyptic number.

It is an amenable number.

320949857 is a deficient number, since it is larger than the sum of its proper divisors (1).

320949857 is an equidigital number, since it uses as much as digits as its factorization.

320949857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 320949857 is about 17915.0734578455. The cubic root of 320949857 is about 684.6664737524. Note that the first 3 decimals are identical.

The spelling of 320949857 in words is "three hundred twenty million, nine hundred forty-nine thousand, eight hundred fifty-seven".