112009981 has 2 divisors, whose sum is σ = 112009982. Its totient is φ = 112009980.

The previous prime is 112009939. The next prime is 112009987. The reversal of 112009981 is 189900211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103836100 + 8173881 = 10190^2 + 2859^2 .

It is a cyclic number.

It is not a de Polignac number, because 112009981 - 2¹¹ = 112007933 is a prime.

It is a super-2 number, since 2×112009981² = 25092471687240722, which contains 22 as substring.

It is equal to p_6411595 and since 112009981 and 6411595 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (112009987) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56004990 + 56004991.

It is an arithmetic number, because the mean of its divisors is an integer number (56004991).

Almost surely, 2^112009981 is an apocalyptic number.

It is an amenable number.

112009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

112009981 is an equidigital number, since it uses as much as digits as its factorization.

112009981 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 31.

The square root of 112009981 is about 10583.4767916786. The cubic root of 112009981 is about 482.0427712371.

The spelling of 112009981 in words is "one hundred twelve million, nine thousand, nine hundred eighty-one".