320517623 has 4 divisors (see below), whose sum is σ = 328335168. Its totient is φ = 312700080.

The previous prime is 320517611. The next prime is 320517641. The reversal of 320517623 is 326715023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326715023 = 23 ⋅14205001.

It is a cyclic number.

It is not a de Polignac number, because 320517623 - 2¹⁴ = 320501239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320517683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3908711 + ... + 3908792.

It is an arithmetic number, because the mean of its divisors is an integer number (82083792).

Almost surely, 2^320517623 is an apocalyptic number.

320517623 is a deficient number, since it is larger than the sum of its proper divisors (7817545).

320517623 is an equidigital number, since it uses as much as digits as its factorization.

320517623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7817544.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 320517623 is about 17903.0059766510. The cubic root of 320517623 is about 684.3589811948.

The spelling of 320517623 in words is "three hundred twenty million, five hundred seventeen thousand, six hundred twenty-three".