822478121 has 4 divisors (see below), whose sum is σ = 822543744. Its totient is φ = 822412500.

The previous prime is 822478093. The next prime is 822478123. The reversal of 822478121 is 121874228.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 822478121 - 2⁶ = 822478057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (822478123) 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, 7505 + ... + 41246.

It is an arithmetic number, because the mean of its divisors is an integer number (205635936).

Almost surely, 2^822478121 is an apocalyptic number.

It is an amenable number.

822478121 is a deficient number, since it is larger than the sum of its proper divisors (65623).

822478121 is a wasteful number, since it uses less digits than its factorization.

With its successor (822478122) it forms an eRAP, since the sums of their prime factors are consecutive (65622 and 65623).

822478121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65622.

The product of its digits is 14336, while the sum is 35.

The square root of 822478121 is about 28678.8793539776. The cubic root of 822478121 is about 936.9320989845.

The spelling of 822478121 in words is "eight hundred twenty-two million, four hundred seventy-eight thousand, one hundred twenty-one".