111581443 has 2 divisors, whose sum is σ = 111581444. Its totient is φ = 111581442.

The previous prime is 111581429. The next prime is 111581479. The reversal of 111581443 is 344185111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111581443 - 2²⁵ = 78027011 is a prime.

It is not a weakly prime, because it can be changed into another prime (111581413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55790721 + 55790722.

It is an arithmetic number, because the mean of its divisors is an integer number (55790722).

Almost surely, 2^111581443 is an apocalyptic number.

111581443 is a deficient number, since it is larger than the sum of its proper divisors (1).

111581443 is an equidigital number, since it uses as much as digits as its factorization.

111581443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 28.

The square root of 111581443 is about 10563.2117748344. The cubic root of 111581443 is about 481.4272378492.

The spelling of 111581443 in words is "one hundred eleven million, five hundred eighty-one thousand, four hundred forty-three".