8591250721 has 9 divisors (see below), whose sum is σ = 8744899633. Its totient is φ = 8440260340.

The previous prime is 8591250709. The next prime is 8591250769. The reversal of 8591250721 is 1270521958.

The square root of 8591250721 is 92689.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 8591250721 - 2⁷ = 8591250593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8591260721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5467866 + ... + 5469436.

Almost surely, 2^8591250721 is an apocalyptic number.

8591250721 is the 92689-th square number.

8591250721 is the 46345-th centered octagonal number.

It is an amenable number.

8591250721 is a deficient number, since it is larger than the sum of its proper divisors (153648912).

8591250721 is an frugal number, since it uses more digits than its factorization.

8591250721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260 (or 1630 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The cubic root of 8591250721 is about 2048.1045911938.

The spelling of 8591250721 in words is "eight billion, five hundred ninety-one million, two hundred fifty thousand, seven hundred twenty-one".