822540217 has 4 divisors (see below), whose sum is σ = 827586640. Its totient is φ = 817493796.

The previous prime is 822540193. The next prime is 822540241. The reversal of 822540217 is 712045228.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (822540193) and next prime (822540241).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-822540217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (822540517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2522967 + ... + 2523292.

It is an arithmetic number, because the mean of its divisors is an integer number (206896660).

Almost surely, 2^822540217 is an apocalyptic number.

It is an amenable number.

822540217 is a deficient number, since it is larger than the sum of its proper divisors (5046423).

822540217 is a wasteful number, since it uses less digits than its factorization.

822540217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046422.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 822540217 is about 28679.9619420947. The cubic root of 822540217 is about 936.9556774320.

The spelling of 822540217 in words is "eight hundred twenty-two million, five hundred forty thousand, two hundred seventeen".