320215523 has 4 divisors (see below), whose sum is σ = 330545088. Its totient is φ = 309885960.

The previous prime is 320215487. The next prime is 320215541. The reversal of 320215523 is 325512023.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 320215523 - 2⁶ = 320215459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320215573) 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, 5164736 + ... + 5164797.

It is an arithmetic number, because the mean of its divisors is an integer number (82636272).

Almost surely, 2^320215523 is an apocalyptic number.

320215523 is a deficient number, since it is larger than the sum of its proper divisors (10329565).

320215523 is a wasteful number, since it uses less digits than its factorization.

320215523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10329564.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 320215523 is about 17894.5668570100. The cubic root of 320215523 is about 684.1439021868.

Adding to 320215523 its reverse (325512023), we get a palindrome (645727546).

The spelling of 320215523 in words is "three hundred twenty million, two hundred fifteen thousand, five hundred twenty-three".