111543989 has 2 divisors, whose sum is σ = 111543990. Its totient is φ = 111543988.

The previous prime is 111543979. The next prime is 111544007. The reversal of 111543989 is 989345111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88981489 + 22562500 = 9433^2 + 4750^2 .

It is a cyclic number.

It is not a de Polignac number, because 111543989 - 2²⁴ = 94766773 is a prime.

It is a super-2 number, since 2×111543989² = 24884122964064242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111543979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55771994 + 55771995.

It is an arithmetic number, because the mean of its divisors is an integer number (55771995).

Almost surely, 2^111543989 is an apocalyptic number.

It is an amenable number.

111543989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111543989 is an equidigital number, since it uses as much as digits as its factorization.

111543989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 41.

The square root of 111543989 is about 10561.4387750912. The cubic root of 111543989 is about 481.3733657083.

The spelling of 111543989 in words is "one hundred eleven million, five hundred forty-three thousand, nine hundred eighty-nine".