1222394989 has 2 divisors, whose sum is σ = 1222394990. Its totient is φ = 1222394988.

The previous prime is 1222394923. The next prime is 1222395017. The reversal of 1222394989 is 9894932221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902521764 + 319873225 = 30042^2 + 17885^2 .

It is an emirp because it is prime and its reverse (9894932221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222394989 - 2⁷ = 1222394861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222394909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611197494 + 611197495.

It is an arithmetic number, because the mean of its divisors is an integer number (611197495).

Almost surely, 2^1222394989 is an apocalyptic number.

It is an amenable number.

1222394989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222394989 is an equidigital number, since it uses as much as digits as its factorization.

1222394989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The square root of 1222394989 is about 34962.7657515821. The cubic root of 1222394989 is about 1069.2284853861.

The spelling of 1222394989 in words is "one billion, two hundred twenty-two million, three hundred ninety-four thousand, nine hundred eighty-nine".