8527721 has 4 divisors (see below), whose sum is σ = 8533632. Its totient is φ = 8521812.

The previous prime is 8527699. The next prime is 8527741. The reversal of 8527721 is 1277258.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1277258 = 2 ⋅638629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8527721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8527741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 4206.

It is an arithmetic number, because the mean of its divisors is an integer number (2133408).

Almost surely, 2^8527721 is an apocalyptic number.

It is an amenable number.

8527721 is a deficient number, since it is larger than the sum of its proper divisors (5911).

8527721 is a wasteful number, since it uses less digits than its factorization.

8527721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910.

The product of its digits is 7840, while the sum is 32.

The square root of 8527721 is about 2920.2261898695. The cubic root of 8527721 is about 204.3043723134.

The spelling of 8527721 in words is "eight million, five hundred twenty-seven thousand, seven hundred twenty-one".