8212565 has 4 divisors (see below), whose sum is σ = 9855084. Its totient is φ = 6570048.

The previous prime is 8212553. The next prime is 8212583. The reversal of 8212565 is 5652128.

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 1623076 + 6589489 = 1274^2 + 2567^2 .

It is a cyclic number.

It is not a de Polignac number, because 8212565 - 2⁴ = 8212549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821252 + ... + 821261.

It is an arithmetic number, because the mean of its divisors is an integer number (2463771).

Almost surely, 2^8212565 is an apocalyptic number.

It is an amenable number.

8212565 is a deficient number, since it is larger than the sum of its proper divisors (1642519).

8212565 is a wasteful number, since it uses less digits than its factorization.

8212565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642518.

The product of its digits is 4800, while the sum is 29.

The square root of 8212565 is about 2865.7573170106. The cubic root of 8212565 is about 201.7559137193.

It can be divided in two parts, 82 and 12565, that multiplied together give a triangular number (1030330 = T₁₄₃₅).

The spelling of 8212565 in words is "eight million, two hundred twelve thousand, five hundred sixty-five".