1122001981 has 2 divisors, whose sum is σ = 1122001982. Its totient is φ = 1122001980.

The previous prime is 1122001963. The next prime is 1122001987. The reversal of 1122001981 is 1891002211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 780084900 + 341917081 = 27930^2 + 18491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122001981 - 2²⁹ = 585131069 is a prime.

It is a super-2 number, since 2×1122001981² = 2517776890735848722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122001987) 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, 561000990 + 561000991.

It is an arithmetic number, because the mean of its divisors is an integer number (561000991).

Almost surely, 2^1122001981 is an apocalyptic number.

It is an amenable number.

1122001981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122001981 is an equidigital number, since it uses as much as digits as its factorization.

1122001981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1122001981 is about 33496.2980193334. The cubic root of 1122001981 is about 1039.1172183991.

The spelling of 1122001981 in words is "one billion, one hundred twenty-two million, one thousand, nine hundred eighty-one".