1220112391 has 2 divisors, whose sum is σ = 1220112392. Its totient is φ = 1220112390.

The previous prime is 1220112373. The next prime is 1220112403. The reversal of 1220112391 is 1932110221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220112391 - 2⁵ = 1220112359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220112191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610056195 + 610056196.

It is an arithmetic number, because the mean of its divisors is an integer number (610056196).

Almost surely, 2^1220112391 is an apocalyptic number.

1220112391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220112391 is an equidigital number, since it uses as much as digits as its factorization.

1220112391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1220112391 is about 34930.1072285786. The cubic root of 1220112391 is about 1068.5625414705.

The spelling of 1220112391 in words is "one billion, two hundred twenty million, one hundred twelve thousand, three hundred ninety-one".