1099225 has 6 divisors (see below), whose sum is σ = 1363070. Its totient is φ = 879360.

The previous prime is 1099223. The next prime is 1099247. The reversal of 1099225 is 5229901.

It can be written as a sum of positive squares in 3 ways, for example, as 121104 + 978121 = 348^2 + 989^2 .

It is not a de Polignac number, because 1099225 - 2¹ = 1099223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1099193 and 1099202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099223) 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, 21960 + ... + 22009.

2^1099225 is an apocalyptic number.

It is an amenable number.

1099225 is a deficient number, since it is larger than the sum of its proper divisors (263845).

1099225 is an equidigital number, since it uses as much as digits as its factorization.

1099225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43979 (or 43974 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1099225 is about 1048.4393163174. The cubic root of 1099225 is about 103.2037629079.

It can be divided in two parts, 10 and 99225, that added together give a triangular number (99235 = T₄₄₅).

The spelling of 1099225 in words is "one million, ninety-nine thousand, two hundred twenty-five".