8251521 has 8 divisors (see below), whose sum is σ = 11023584. Its totient is φ = 5490240.

The previous prime is 8251513. The next prime is 8251541. The reversal of 8251521 is 1251528.

8251521 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8251521 - 2³ = 8251513 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8251491 and 8251500.

It is not an unprimeable number, because it can be changed into a prime (8251501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696 + ... + 4121.

It is an arithmetic number, because the mean of its divisors is an integer number (1377948).

Almost surely, 2^8251521 is an apocalyptic number.

It is an amenable number.

8251521 is a deficient number, since it is larger than the sum of its proper divisors (2772063).

8251521 is a wasteful number, since it uses less digits than its factorization.

8251521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391.

The product of its digits is 800, while the sum is 24.

The square root of 8251521 is about 2872.5460831813. The cubic root of 8251521 is about 202.0744178965.

It can be divided in two parts, 825 and 1521, that added together give a triangular number (2346 = T₆₈).

The spelling of 8251521 in words is "eight million, two hundred fifty-one thousand, five hundred twenty-one".