111880861 has 2 divisors, whose sum is σ = 111880862. Its totient is φ = 111880860.

The previous prime is 111880837. The next prime is 111880897. The reversal of 111880861 is 168088111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104427961 + 7452900 = 10219^2 + 2730^2 .

It is an emirp because it is prime and its reverse (168088111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111880861 - 2¹³ = 111872669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111880801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55940430 + 55940431.

It is an arithmetic number, because the mean of its divisors is an integer number (55940431).

Almost surely, 2^111880861 is an apocalyptic number.

It is an amenable number.

111880861 is a deficient number, since it is larger than the sum of its proper divisors (1).

111880861 is an equidigital number, since it uses as much as digits as its factorization.

111880861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 34.

The square root of 111880861 is about 10577.3749578995. The cubic root of 111880861 is about 481.8574743741.

The spelling of 111880861 in words is "one hundred eleven million, eight hundred eighty thousand, eight hundred sixty-one".