8521397 has 2 divisors, whose sum is σ = 8521398. Its totient is φ = 8521396.

The previous prime is 8521391. The next prime is 8521411. The reversal of 8521397 is 7931258.

8521397 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4990756 + 3530641 = 2234^2 + 1879^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521397 - 2⁸ = 8521141 is a prime.

It is a super-2 number, since 2×8521397² = 145228413663218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8521391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260698 + 4260699.

It is an arithmetic number, because the mean of its divisors is an integer number (4260699).

Almost surely, 2^8521397 is an apocalyptic number.

It is an amenable number.

8521397 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521397 is an equidigital number, since it uses as much as digits as its factorization.

8521397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 8521397 is about 2919.1431962136. The cubic root of 8521397 is about 204.2538570444.

The spelling of 8521397 in words is "eight million, five hundred twenty-one thousand, three hundred ninety-seven".