320561123 has 2 divisors, whose sum is σ = 320561124. Its totient is φ = 320561122.

The previous prime is 320561077. The next prime is 320561149. The reversal of 320561123 is 321165023.

It is a strong prime.

It is an emirp because it is prime and its reverse (321165023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320561123 - 2¹⁴ = 320544739 is a prime.

It is a super-2 number, since 2×320561123² = 205518867158042258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320581123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160280561 + 160280562.

It is an arithmetic number, because the mean of its divisors is an integer number (160280562).

Almost surely, 2^320561123 is an apocalyptic number.

320561123 is a deficient number, since it is larger than the sum of its proper divisors (1).

320561123 is an equidigital number, since it uses as much as digits as its factorization.

320561123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 320561123 is about 17904.2208152156. The cubic root of 320561123 is about 684.3899397307.

The spelling of 320561123 in words is "three hundred twenty million, five hundred sixty-one thousand, one hundred twenty-three".