8351521 has 4 divisors (see below), whose sum is σ = 8397844. Its totient is φ = 8305200.

The previous prime is 8351513. The next prime is 8351527. The reversal of 8351521 is 1251538.

It is a happy number.

8351521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 291600 + 8059921 = 540^2 + 2839^2 .

It is a cyclic number.

It is not a de Polignac number, because 8351521 - 2³ = 8351513 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8351527) 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, 22890 + ... + 23251.

It is an arithmetic number, because the mean of its divisors is an integer number (2099461).

Almost surely, 2^8351521 is an apocalyptic number.

It is an amenable number.

8351521 is a deficient number, since it is larger than the sum of its proper divisors (46323).

8351521 is a wasteful number, since it uses less digits than its factorization.

8351521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46322.

The product of its digits is 1200, while the sum is 25.

The square root of 8351521 is about 2889.8998252535. The cubic root of 8351521 is about 202.8874540956.

The spelling of 8351521 in words is "eight million, three hundred fifty-one thousand, five hundred twenty-one".