1222998035981 has 2 divisors, whose sum is σ = 1222998035982. Its totient is φ = 1222998035980.

The previous prime is 1222998035953. The next prime is 1222998035983. The reversal of 1222998035981 is 1895308992221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121470410025 + 101527625956 = 1058995^2 + 318634^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222998035981 - 2²² = 1222993841677 is a prime.

It is a super-2 number, since 2×1222998035981² (a number of 25 digits) contains 22 as substring.

Together with 1222998035983, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222998035981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222998035983) 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, 611499017990 + 611499017991.

It is an arithmetic number, because the mean of its divisors is an integer number (611499017991).

Almost surely, 2^{1222998035981} is an apocalyptic number.

It is an amenable number.

1222998035981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222998035981 is an equidigital number, since it uses as much as digits as its factorization.

1222998035981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 59.

The spelling of 1222998035981 in words is "one trillion, two hundred twenty-two billion, nine hundred ninety-eight million, thirty-five thousand, nine hundred eighty-one".