320621269 has 2 divisors, whose sum is σ = 320621270. Its totient is φ = 320621268.

The previous prime is 320621267. The next prime is 320621291. The reversal of 320621269 is 962126023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277888900 + 42732369 = 16670^2 + 6537^2 .

It is an emirp because it is prime and its reverse (962126023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320621269 - 2¹ = 320621267 is a prime.

It is a super-2 number, since 2×320621269² = 205595996270340722, which contains 22 as substring.

Together with 320621267, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 320621269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320621267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160310634 + 160310635.

It is an arithmetic number, because the mean of its divisors is an integer number (160310635).

Almost surely, 2^320621269 is an apocalyptic number.

It is an amenable number.

320621269 is a deficient number, since it is larger than the sum of its proper divisors (1).

320621269 is an equidigital number, since it uses as much as digits as its factorization.

320621269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 320621269 is about 17905.9003962381. The cubic root of 320621269 is about 684.4327404533.

The spelling of 320621269 in words is "three hundred twenty million, six hundred twenty-one thousand, two hundred sixty-nine".