8345521 has 4 divisors (see below), whose sum is σ = 8836452. Its totient is φ = 7854592.

The previous prime is 8345501. The next prime is 8345549. The reversal of 8345521 is 1255438.

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 4562496 + 3783025 = 2136^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 8345521 - 2⁵ = 8345489 is a prime.

It is a super-2 number, since 2×8345521² = 139295441522882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8345521.

It is not an unprimeable number, because it can be changed into a prime (8345501) 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, 245440 + ... + 245473.

It is an arithmetic number, because the mean of its divisors is an integer number (2209113).

Almost surely, 2^8345521 is an apocalyptic number.

It is an amenable number.

8345521 is a deficient number, since it is larger than the sum of its proper divisors (490931).

8345521 is a wasteful number, since it uses less digits than its factorization.

8345521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490930.

The product of its digits is 4800, while the sum is 28.

The square root of 8345521 is about 2888.8615404688. The cubic root of 8345521 is about 202.8388555085.

The spelling of 8345521 in words is "eight million, three hundred forty-five thousand, five hundred twenty-one".