111100981 has 2 divisors, whose sum is σ = 111100982. Its totient is φ = 111100980.

The previous prime is 111100921. The next prime is 111101033. The reversal of 111100981 is 189001111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85396081 + 25704900 = 9241^2 + 5070^2 .

It is a cyclic number.

It is not a de Polignac number, because 111100981 - 2⁹ = 111100469 is a prime.

It is a super-2 number, since 2×111100981² = 24686855958324722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111100901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550490 + 55550491.

It is an arithmetic number, because the mean of its divisors is an integer number (55550491).

Almost surely, 2^111100981 is an apocalyptic number.

It is an amenable number.

111100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100981 is an equidigital number, since it uses as much as digits as its factorization.

111100981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The square root of 111100981 is about 10540.4450095810. The cubic root of 111100981 is about 480.7352461767.

The spelling of 111100981 in words is "one hundred eleven million, one hundred thousand, nine hundred eighty-one".