8985125721 has 32 divisors (see below), whose sum is σ = 14095847808. Its totient is φ = 5019056640.

The previous prime is 8985125711. The next prime is 8985125749. The reversal of 8985125721 is 1275215898.

It is not a de Polignac number, because 8985125721 - 2⁶ = 8985125657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8985125711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274965 + ... + 305901.

It is an arithmetic number, because the mean of its divisors is an integer number (440495244).

Almost surely, 2^8985125721 is an apocalyptic number.

It is an amenable number.

8985125721 is a deficient number, since it is larger than the sum of its proper divisors (5110722087).

8985125721 is a wasteful number, since it uses less digits than its factorization.

8985125721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31641.

The product of its digits is 403200, while the sum is 48.

The square root of 8985125721 is about 94789.9030540701. The cubic root of 8985125721 is about 2078.9372746268.

The spelling of 8985125721 in words is "eight billion, nine hundred eighty-five million, one hundred twenty-five thousand, seven hundred twenty-one".