1222099979 has 2 divisors, whose sum is σ = 1222099980. Its totient is φ = 1222099978.

The previous prime is 1222099951. The next prime is 1222099999. The reversal of 1222099979 is 9799902221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222099979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1222099909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611049989 + 611049990.

It is an arithmetic number, because the mean of its divisors is an integer number (611049990).

Almost surely, 2^1222099979 is an apocalyptic number.

1222099979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222099979 is an equidigital number, since it uses as much as digits as its factorization.

1222099979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 50.

The square root of 1222099979 is about 34958.5465801998. The cubic root of 1222099979 is about 1069.1424634164.

The spelling of 1222099979 in words is "one billion, two hundred twenty-two million, ninety-nine thousand, nine hundred seventy-nine".