111561025 has 24 divisors (see below), whose sum is σ = 141921720. Its totient is φ = 86960640.

The previous prime is 111561019. The next prime is 111561053. The reversal of 111561025 is 520165111.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 82573569 + 28987456 = 9087^2 + 5384^2 .

It is not a de Polignac number, because 111561025 - 2⁵ = 111560993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111560987 and 111561005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356269 + ... + 356581.

It is an arithmetic number, because the mean of its divisors is an integer number (5913405).

Almost surely, 2^111561025 is an apocalyptic number.

It is an amenable number.

111561025 is a deficient number, since it is larger than the sum of its proper divisors (30360695).

111561025 is a wasteful number, since it uses less digits than its factorization.

111561025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 111561025 is about 10562.2452632004. The cubic root of 111561025 is about 481.3978710157.

The spelling of 111561025 in words is "one hundred eleven million, five hundred sixty-one thousand, twenty-five".