1222431979 has 2 divisors, whose sum is σ = 1222431980. Its totient is φ = 1222431978.

The previous prime is 1222431953. The next prime is 1222432049. The reversal of 1222431979 is 9791342221.

It is a weak prime.

It is an emirp because it is prime and its reverse (9791342221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222431979 is a prime.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 611215989 + 611215990.

It is an arithmetic number, because the mean of its divisors is an integer number (611215990).

Almost surely, 2^1222431979 is an apocalyptic number.

1222431979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222431979 is an equidigital number, since it uses as much as digits as its factorization.

1222431979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 1222431979 is about 34963.2947389115. The cubic root of 1222431979 is about 1069.2392703241.

The spelling of 1222431979 in words is "one billion, two hundred twenty-two million, four hundred thirty-one thousand, nine hundred seventy-nine".