111800981 has 2 divisors, whose sum is σ = 111800982. Its totient is φ = 111800980.

The previous prime is 111800963. The next prime is 111800987. The reversal of 111800981 is 189008111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89000356 + 22800625 = 9434^2 + 4775^2 .

It is an emirp because it is prime and its reverse (189008111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111800981 - 2¹⁴ = 111784597 is a prime.

It is a super-2 number, since 2×111800981² = 24998918705124722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111800987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55900490 + 55900491.

It is an arithmetic number, because the mean of its divisors is an integer number (55900491).

Almost surely, 2^111800981 is an apocalyptic number.

It is an amenable number.

111800981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111800981 is an equidigital number, since it uses as much as digits as its factorization.

111800981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 111800981 is about 10573.5982995383. The cubic root of 111800981 is about 481.7427692053.

The spelling of 111800981 in words is "one hundred eleven million, eight hundred thousand, nine hundred eighty-one".