825220913 has 4 divisors (see below), whose sum is σ = 900241008. Its totient is φ = 750200820.

The previous prime is 825220909. The next prime is 825220927. The reversal of 825220913 is 319022528.

It is a happy number.

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 825220913 - 2² = 825220909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 825220913.

It is not an unprimeable number, because it can be changed into a prime (825220813) 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, 37510031 + ... + 37510052.

It is an arithmetic number, because the mean of its divisors is an integer number (225060252).

Almost surely, 2^825220913 is an apocalyptic number.

It is an amenable number.

825220913 is a deficient number, since it is larger than the sum of its proper divisors (75020095).

825220913 is a wasteful number, since it uses less digits than its factorization.

825220913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75020094.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 825220913 is about 28726.6585770082. The cubic root of 825220913 is about 937.9724340761.

The spelling of 825220913 in words is "eight hundred twenty-five million, two hundred twenty thousand, nine hundred thirteen".