422644861 has 2 divisors, whose sum is σ = 422644862. Its totient is φ = 422644860.

The previous prime is 422644841. The next prime is 422644879. The reversal of 422644861 is 168446224.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341103961 + 81540900 = 18469^2 + 9030^2 .

It is a cyclic number.

It is not a de Polignac number, because 422644861 - 2⁹ = 422644349 is a prime.

It is a super-3 number, since 3×422644861³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 422644861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422644801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211322430 + 211322431.

It is an arithmetic number, because the mean of its divisors is an integer number (211322431).

Almost surely, 2^422644861 is an apocalyptic number.

It is an amenable number.

422644861 is a deficient number, since it is larger than the sum of its proper divisors (1).

422644861 is an equidigital number, since it uses as much as digits as its factorization.

422644861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 37.

The square root of 422644861 is about 20558.3282637475. The cubic root of 422644861 is about 750.4559366987.

The spelling of 422644861 in words is "four hundred twenty-two million, six hundred forty-four thousand, eight hundred sixty-one".