111145554 has 96 divisors (see below), whose sum is σ = 281966400. Its totient is φ = 32348160.

The previous prime is 111145543. The next prime is 111145597. The reversal of 111145554 is 455541111.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173074 + ... + 173714.

It is an arithmetic number, because the mean of its divisors is an integer number (2937150).

Almost surely, 2^111145554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111145554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140983200).

111145554 is an abundant number, since it is smaller than the sum of its proper divisors (170820846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111145554 is a wasteful number, since it uses less digits than its factorization.

111145554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 678 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 111145554 is about 10542.5591769741. The cubic root of 111145554 is about 480.7995268788.

Adding to 111145554 its reverse (455541111), we get a palindrome (566686665).

It can be divided in two parts, 1111 and 45554, that added together give a triangular number (46665 = T₃₀₅).

The spelling of 111145554 in words is "one hundred eleven million, one hundred forty-five thousand, five hundred fifty-four".