320699957 has 2 divisors, whose sum is σ = 320699958. Its totient is φ = 320699956.

The previous prime is 320699933. The next prime is 320699959. The reversal of 320699957 is 759996023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232227121 + 88472836 = 15239^2 + 9406^2 .

It is a cyclic number.

It is not a de Polignac number, because 320699957 - 2¹⁸ = 320437813 is a prime.

Together with 320699959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320699959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160349978 + 160349979.

It is an arithmetic number, because the mean of its divisors is an integer number (160349979).

Almost surely, 2^320699957 is an apocalyptic number.

It is an amenable number.

320699957 is a deficient number, since it is larger than the sum of its proper divisors (1).

320699957 is an equidigital number, since it uses as much as digits as its factorization.

320699957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 50.

The square root of 320699957 is about 17908.0975259797. The cubic root of 320699957 is about 684.4887278372.

The spelling of 320699957 in words is "three hundred twenty million, six hundred ninety-nine thousand, nine hundred fifty-seven".