1112009981 has 2 divisors, whose sum is σ = 1112009982. Its totient is φ = 1112009980.

The previous prime is 1112009953. The next prime is 1112009999. The reversal of 1112009981 is 1899002111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 967769881 + 144240100 = 31109^2 + 12010^2 .

It is a cyclic number.

It is not a de Polignac number, because 1112009981 - 2⁶ = 1112009917 is a prime.

It is a super-2 number, since 2×1112009981² = 2473132395687240722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1112009281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556004990 + 556004991.

It is an arithmetic number, because the mean of its divisors is an integer number (556004991).

Almost surely, 2^1112009981 is an apocalyptic number.

It is an amenable number.

1112009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112009981 is an equidigital number, since it uses as much as digits as its factorization.

1112009981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 1112009981 is about 33346.8136558802. The cubic root of 1112009981 is about 1036.0233931426.

The spelling of 1112009981 in words is "one billion, one hundred twelve million, nine thousand, nine hundred eighty-one".