111861025 has 6 divisors (see below), whose sum is σ = 138707702. Its totient is φ = 89488800.

The previous prime is 111861023. The next prime is 111861041. The reversal of 111861025 is 520168111.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 26501904 + 85359121 = 5148^2 + 9239^2 .

It is not a de Polignac number, because 111861025 - 2¹ = 111861023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 4474441 = 111861025 / (1 + 1 + 1 + 8 + 6 + 1 + 0 + 2 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111861023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2237196 + ... + 2237245.

Almost surely, 2^111861025 is an apocalyptic number.

It is an amenable number.

111861025 is a deficient number, since it is larger than the sum of its proper divisors (26846677).

111861025 is an equidigital number, since it uses as much as digits as its factorization.

111861025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4474451 (or 4474446 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 111861025 is about 10576.4372545768. The cubic root of 111861025 is about 481.8289955986.

The spelling of 111861025 in words is "one hundred eleven million, eight hundred sixty-one thousand, twenty-five".