8900611721 has 4 divisors (see below), whose sum is σ = 8913309444. Its totient is φ = 8887914000.

The previous prime is 8900611679. The next prime is 8900611723. The reversal of 8900611721 is 1271160098.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5959068025 + 2941543696 = 77195^2 + 54236^2 .

It is a cyclic number.

It is not a de Polignac number, because 8900611721 - 2¹⁴ = 8900595337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8900611723) 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, 6347810 + ... + 6349211.

It is an arithmetic number, because the mean of its divisors is an integer number (2228327361).

Almost surely, 2^8900611721 is an apocalyptic number.

It is an amenable number.

8900611721 is a deficient number, since it is larger than the sum of its proper divisors (12697723).

8900611721 is a wasteful number, since it uses less digits than its factorization.

8900611721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12697722.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 8900611721 is about 94343.0533796739. The cubic root of 8900611721 is about 2072.3985763980.

The spelling of 8900611721 in words is "eight billion, nine hundred million, six hundred eleven thousand, seven hundred twenty-one".