111221858989 has 2 divisors, whose sum is σ = 111221858990. Its totient is φ = 111221858988.

The previous prime is 111221858983. The next prime is 111221858999. The reversal of 111221858989 is 989858122111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90042004900 + 21179854089 = 300070^2 + 145533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221858989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221858983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610929494 + 55610929495.

It is an arithmetic number, because the mean of its divisors is an integer number (55610929495).

Almost surely, 2^111221858989 is an apocalyptic number.

It is an amenable number.

111221858989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221858989 is an equidigital number, since it uses as much as digits as its factorization.

111221858989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 55.

The spelling of 111221858989 in words is "one hundred eleven billion, two hundred twenty-one million, eight hundred fifty-eight thousand, nine hundred eighty-nine".