1089990225 has 81 divisors (see below), whose sum is σ = 2046115227. Its totient is φ = 554652000.

The previous prime is 1089990197. The next prime is 1089990227. The reversal of 1089990225 is 5220999801.

The square root of 1089990225 is 33015.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 392396481 + 697593744 = 19809^2 + 26412^2 .

It is not a de Polignac number, because 1089990225 - 2⁹ = 1089989713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1089990227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 15351940 + ... + 15352010.

Almost surely, 2^1089990225 is an apocalyptic number.

1089990225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1089990225 is the 33015-th square number.

1089990225 is the 16508-th centered octagonal number.

It is an amenable number.

1089990225 is a deficient number, since it is larger than the sum of its proper divisors (956125002).

1089990225 is an equidigital number, since it uses as much as digits as its factorization.

1089990225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The cubic root of 1089990225 is about 1029.1393901502.

It can be divided in two parts, 10899 and 90225, that added together give a square (101124 = 318²).

The spelling of 1089990225 in words is "one billion, eighty-nine million, nine hundred ninety thousand, two hundred twenty-five".