320806253 has 4 divisors (see below), whose sum is σ = 321940128. Its totient is φ = 319672380.

The previous prime is 320806247. The next prime is 320806261. The reversal of 320806253 is 352608023.

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, and also an emirpimes, since its reverse is a distinct semiprime: 352608023 = 19 ⋅18558317.

It is a cyclic number.

It is not a de Polignac number, because 320806253 - 2¹⁴ = 320789869 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 (320802253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566513 + ... + 567078.

It is an arithmetic number, because the mean of its divisors is an integer number (80485032).

Almost surely, 2^320806253 is an apocalyptic number.

It is an amenable number.

320806253 is a deficient number, since it is larger than the sum of its proper divisors (1133875).

320806253 is a wasteful number, since it uses less digits than its factorization.

320806253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133874.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 320806253 is about 17911.0650995411. The cubic root of 320806253 is about 684.5643440792.

The spelling of 320806253 in words is "three hundred twenty million, eight hundred six thousand, two hundred fifty-three".