822220261 has 4 divisors (see below), whose sum is σ = 857968992. Its totient is φ = 786471532.

The previous prime is 822220247. The next prime is 822220271. The reversal of 822220261 is 162022228.

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 822220261 - 2²⁹ = 285349349 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 (822220271) 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, 17874331 + ... + 17874376.

It is an arithmetic number, because the mean of its divisors is an integer number (214492248).

Almost surely, 2^822220261 is an apocalyptic number.

It is an amenable number.

822220261 is a deficient number, since it is larger than the sum of its proper divisors (35748731).

822220261 is a wasteful number, since it uses less digits than its factorization.

822220261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35748730.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 822220261 is about 28674.3833586705. The cubic root of 822220261 is about 936.8341743681.

Adding to 822220261 its reverse (162022228), we get a palindrome (984242489).

The spelling of 822220261 in words is "eight hundred twenty-two million, two hundred twenty thousand, two hundred sixty-one".