320263521 has 4 divisors (see below), whose sum is σ = 427018032. Its totient is φ = 213509012.

The previous prime is 320263507. The next prime is 320263543. The reversal of 320263521 is 125362023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320263521 - 2¹⁸ = 320001377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320263491 and 320263500.

It is not an unprimeable number, because it can be changed into a prime (320263421) 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, 53377251 + ... + 53377256.

It is an arithmetic number, because the mean of its divisors is an integer number (106754508).

Almost surely, 2^320263521 is an apocalyptic number.

It is an amenable number.

320263521 is a deficient number, since it is larger than the sum of its proper divisors (106754511).

320263521 is a wasteful number, since it uses less digits than its factorization.

320263521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106754510.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 320263521 is about 17895.9079400851. The cubic root of 320263521 is about 684.1780832264.

The spelling of 320263521 in words is "three hundred twenty million, two hundred sixty-three thousand, five hundred twenty-one".