1222455779 has 2 divisors, whose sum is σ = 1222455780. Its totient is φ = 1222455778.

The previous prime is 1222455769. The next prime is 1222455791. The reversal of 1222455779 is 9775542221.

It is a weak prime.

It is an emirp because it is prime and its reverse (9775542221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222455779 - 2⁸ = 1222455523 is a prime.

It is a super-2 number, since 2×1222455779² = 2988796263220993682, which contains 22 as substring.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1222455769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611227889 + 611227890.

It is an arithmetic number, because the mean of its divisors is an integer number (611227890).

Almost surely, 2^1222455779 is an apocalyptic number.

1222455779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222455779 is an equidigital number, since it uses as much as digits as its factorization.

1222455779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 44.

The square root of 1222455779 is about 34963.6350941947. The cubic root of 1222455779 is about 1069.2462094231.

The spelling of 1222455779 in words is "one billion, two hundred twenty-two million, four hundred fifty-five thousand, seven hundred seventy-nine".