82213609 has 4 divisors (see below), whose sum is σ = 83607120. Its totient is φ = 80820100.

The previous prime is 82213603. The next prime is 82213613. The reversal of 82213609 is 90631228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82213609 - 2⁹ = 82213097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82213603) 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, 696667 + ... + 696784.

It is an arithmetic number, because the mean of its divisors is an integer number (20901780).

Almost surely, 2^82213609 is an apocalyptic number.

It is an amenable number.

82213609 is a deficient number, since it is larger than the sum of its proper divisors (1393511).

82213609 is a wasteful number, since it uses less digits than its factorization.

82213609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393510.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 82213609 is about 9067.1720508657. The cubic root of 82213609 is about 434.8250655210.

The spelling of 82213609 in words is "eighty-two million, two hundred thirteen thousand, six hundred nine".