1111011989 has 2 divisors, whose sum is σ = 1111011990. Its totient is φ = 1111011988.

The previous prime is 1111011961. The next prime is 1111012003. The reversal of 1111011989 is 9891101111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725871364 + 385140625 = 26942^2 + 19625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111011989 is a prime.

It is a super-2 number, since 2×1111011989² = 2468695279403472242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111011929) 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, 555505994 + 555505995.

It is an arithmetic number, because the mean of its divisors is an integer number (555505995).

Almost surely, 2^1111011989 is an apocalyptic number.

It is an amenable number.

1111011989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111011989 is an equidigital number, since it uses as much as digits as its factorization.

1111011989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 32.

The square root of 1111011989 is about 33331.8464685052. The cubic root of 1111011989 is about 1035.7133681908.

The spelling of 1111011989 in words is "one billion, one hundred eleven million, eleven thousand, nine hundred eighty-nine".