825918321 has 4 divisors (see below), whose sum is σ = 1101224432. Its totient is φ = 550612212.

The previous prime is 825918311. The next prime is 825918323. The reversal of 825918321 is 123819528.

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 not a de Polignac number, because 825918321 - 2⁷ = 825918193 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 825918321.

It is not an unprimeable number, because it can be changed into a prime (825918323) 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, 137653051 + ... + 137653056.

It is an arithmetic number, because the mean of its divisors is an integer number (275306108).

Almost surely, 2^825918321 is an apocalyptic number.

It is an amenable number.

825918321 is a deficient number, since it is larger than the sum of its proper divisors (275306111).

825918321 is a wasteful number, since it uses less digits than its factorization.

825918321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275306110.

The product of its digits is 34560, while the sum is 39.

The square root of 825918321 is about 28738.7947033274. The cubic root of 825918321 is about 938.2365917410.

The spelling of 825918321 in words is "eight hundred twenty-five million, nine hundred eighteen thousand, three hundred twenty-one".