1222431989 has 4 divisors (see below), whose sum is σ = 1224060480. Its totient is φ = 1220803500.

The previous prime is 1222431979. The next prime is 1222432049. The reversal of 1222431989 is 9891342221.

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 an emirpimes, since its reverse is a distinct semiprime: 9891342221 = 19 ⋅520596959.

It is a cyclic number.

It is not a de Polignac number, because 1222431989 - 2¹² = 1222427893 is a prime.

It is a super-2 number, since 2×1222431989² = 2988679935460992242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222431919) 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 in 3 ways as a sum of consecutive naturals, for example, 813119 + ... + 814620.

It is an arithmetic number, because the mean of its divisors is an integer number (306015120).

Almost surely, 2^1222431989 is an apocalyptic number.

It is an amenable number.

1222431989 is a deficient number, since it is larger than the sum of its proper divisors (1628491).

1222431989 is an equidigital number, since it uses as much as digits as its factorization.

1222431989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628490.

The product of its digits is 62208, while the sum is 41.

The square root of 1222431989 is about 34963.2948819187. The cubic root of 1222431989 is about 1069.2392732397.

The spelling of 1222431989 in words is "one billion, two hundred twenty-two million, four hundred thirty-one thousand, nine hundred eighty-nine".