111201020981 has 2 divisors, whose sum is σ = 111201020982. Its totient is φ = 111201020980.

The previous prime is 111201020951. The next prime is 111201020999. The reversal of 111201020981 is 189020102111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86279662756 + 24921358225 = 293734^2 + 157865^2 .

It is a cyclic number.

It is not a de Polignac number, because 111201020981 - 2²² = 111196826677 is a prime.

It is a super-2 number, since 2×111201020981² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111201020981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111201020951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600510490 + 55600510491.

It is an arithmetic number, because the mean of its divisors is an integer number (55600510491).

Almost surely, 2^111201020981 is an apocalyptic number.

It is an amenable number.

111201020981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111201020981 is an equidigital number, since it uses as much as digits as its factorization.

111201020981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 111201020981 in words is "one hundred eleven billion, two hundred one million, twenty thousand, nine hundred eighty-one".