82213909 has 4 divisors (see below), whose sum is σ = 83561740. Its totient is φ = 80866080.

The previous prime is 82213903. The next prime is 82213919. The reversal of 82213909 is 90931228.

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 20277009 + 61936900 = 4503^2 + 7870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82213909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82213903) 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, 673824 + ... + 673945.

It is an arithmetic number, because the mean of its divisors is an integer number (20890435).

Almost surely, 2^82213909 is an apocalyptic number.

It is an amenable number.

82213909 is a deficient number, since it is larger than the sum of its proper divisors (1347831).

82213909 is a wasteful number, since it uses less digits than its factorization.

82213909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347830.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 82213909 is about 9067.1885940461. The cubic root of 82213909 is about 434.8255944171.

The spelling of 82213909 in words is "eighty-two million, two hundred thirteen thousand, nine hundred nine".