320527621 has 4 divisors (see below), whose sum is σ = 320655532. Its totient is φ = 320399712.

The previous prime is 320527607. The next prime is 320527637. The reversal of 320527621 is 126725023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126725023 = 443 ⋅286061.

It can be written as a sum of positive squares in 2 ways, for example, as 161010721 + 159516900 = 12689^2 + 12630^2 .

It is a cyclic number.

It is not a de Polignac number, because 320527621 - 2¹³ = 320519429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320527621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320527021) 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, 60120 + ... + 65233.

It is an arithmetic number, because the mean of its divisors is an integer number (80163883).

Almost surely, 2^320527621 is an apocalyptic number.

It is an amenable number.

320527621 is a deficient number, since it is larger than the sum of its proper divisors (127911).

320527621 is a wasteful number, since it uses less digits than its factorization.

320527621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127910.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 320527621 is about 17903.2852013255. The cubic root of 320527621 is about 684.3660969241.

The spelling of 320527621 in words is "three hundred twenty million, five hundred twenty-seven thousand, six hundred twenty-one".