1222230201991 has 2 divisors, whose sum is σ = 1222230201992. Its totient is φ = 1222230201990.

The previous prime is 1222230201853. The next prime is 1222230202021. The reversal of 1222230201991 is 1991020322221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1222230201991 - 2³¹ = 1220082718343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222230205991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611115100995 + 611115100996.

It is an arithmetic number, because the mean of its divisors is an integer number (611115100996).

Almost surely, 2^{1222230201991} is an apocalyptic number.

1222230201991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222230201991 is an equidigital number, since it uses as much as digits as its factorization.

1222230201991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 1222230201991 in words is "one trillion, two hundred twenty-two billion, two hundred thirty million, two hundred one thousand, nine hundred ninety-one".