9021781825 has 24 divisors (see below), whose sum is σ = 13226028480. Its totient is φ = 5973038400.

The previous prime is 9021781781. The next prime is 9021781841. The reversal of 9021781825 is 5281871209.

It is a happy number.

It is not a de Polignac number, because 9021781825 - 2¹¹ = 9021779777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 883771 + ... + 893920.

It is an arithmetic number, because the mean of its divisors is an integer number (551084520).

Almost surely, 2^9021781825 is an apocalyptic number.

It is an amenable number.

9021781825 is a deficient number, since it is larger than the sum of its proper divisors (4204246655).

9021781825 is a wasteful number, since it uses less digits than its factorization.

9021781825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777737 (or 1777732 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 9021781825 is about 94983.0607266369. The cubic root of 9021781825 is about 2081.7605459909.

The spelling of 9021781825 in words is "nine billion, twenty-one million, seven hundred eighty-one thousand, eight hundred twenty-five".