825193921 has 8 divisors (see below), whose sum is σ = 889812000. Its totient is φ = 762694560.

The previous prime is 825193891. The next prime is 825193939. The reversal of 825193921 is 129391528.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 825193921 - 2¹⁹ = 824669633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (825193961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528871 + ... + 530428.

It is an arithmetic number, because the mean of its divisors is an integer number (111226500).

Almost surely, 2^825193921 is an apocalyptic number.

It is an amenable number.

825193921 is a deficient number, since it is larger than the sum of its proper divisors (64618079).

825193921 is a wasteful number, since it uses less digits than its factorization.

825193921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059359.

The product of its digits is 38880, while the sum is 40.

The square root of 825193921 is about 28726.1887656542. The cubic root of 825193921 is about 937.9622073083.

The spelling of 825193921 in words is "eight hundred twenty-five million, one hundred ninety-three thousand, nine hundred twenty-one".