321552313 has 2 divisors, whose sum is σ = 321552314. Its totient is φ = 321552312.

The previous prime is 321552277. The next prime is 321552337. The reversal of 321552313 is 313255123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321413184 + 139129 = 17928^2 + 373^2 .

It is an emirp because it is prime and its reverse (313255123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321552313 - 2²¹ = 319455161 is a prime.

It is not a weakly prime, because it can be changed into another prime (321555313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160776156 + 160776157.

It is an arithmetic number, because the mean of its divisors is an integer number (160776157).

Almost surely, 2^321552313 is an apocalyptic number.

It is an amenable number.

321552313 is a deficient number, since it is larger than the sum of its proper divisors (1).

321552313 is an equidigital number, since it uses as much as digits as its factorization.

321552313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 25.

The square root of 321552313 is about 17931.8797954927. The cubic root of 321552313 is about 685.0946025238.

The spelling of 321552313 in words is "three hundred twenty-one million, five hundred fifty-two thousand, three hundred thirteen".