222020857 has 2 divisors, whose sum is σ = 222020858. Its totient is φ = 222020856.

The previous prime is 222020849. The next prime is 222020881. The reversal of 222020857 is 758020222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179131456 + 42889401 = 13384^2 + 6549^2 .

It is a cyclic number.

It is not a de Polignac number, because 222020857 - 2³ = 222020849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222020957) 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 as a sum of consecutive naturals, namely, 111010428 + 111010429.

It is an arithmetic number, because the mean of its divisors is an integer number (111010429).

Almost surely, 2^222020857 is an apocalyptic number.

It is an amenable number.

222020857 is a deficient number, since it is larger than the sum of its proper divisors (1).

222020857 is an equidigital number, since it uses as much as digits as its factorization.

222020857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 222020857 is about 14900.3643244050. The cubic root of 222020857 is about 605.5238565432.

The spelling of 222020857 in words is "two hundred twenty-two million, twenty thousand, eight hundred fifty-seven".