8370521 has 2 divisors, whose sum is σ = 8370522. Its totient is φ = 8370520.

The previous prime is 8370517. The next prime is 8370529. The reversal of 8370521 is 1250738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4326400 + 4044121 = 2080^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 8370521 - 2² = 8370517 is a prime.

It is a super-2 number, since 2×8370521² = 140131243622882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8370529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4185260 + 4185261.

It is an arithmetic number, because the mean of its divisors is an integer number (4185261).

Almost surely, 2^8370521 is an apocalyptic number.

It is an amenable number.

8370521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8370521 is an equidigital number, since it uses as much as digits as its factorization.

8370521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 8370521 is about 2893.1852688689. The cubic root of 8370521 is about 203.0411962304.

The spelling of 8370521 in words is "eight million, three hundred seventy thousand, five hundred twenty-one".