1099917225 has 135 divisors (see below), whose sum is σ = 2273409831. Its totient is φ = 525333600.

The previous prime is 1099917223. The next prime is 1099917233. The reversal of 1099917225 is 5227199901.

The square root of 1099917225 is 33165.

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., 395970201 + 703947024 = 19899^2 + 26532^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 1099917225 - 2¹ = 1099917223 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 (1099917223) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 16416642 + ... + 16416708.

Almost surely, 2^1099917225 is an apocalyptic number.

1099917225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1099917225 is the 33165-th square number.

1099917225 is the 16583-rd centered octagonal number.

It is an amenable number.

1099917225 is an abundant number, since it is smaller than the sum of its proper divisors (1173492606).

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

1099917225 is an equidigital number, since it uses as much as digits as its factorization.

1099917225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The cubic root of 1099917225 is about 1032.2542217806.

It can be divided in two parts, 10999 and 17225, that added together give a square (28224 = 168²).

The spelling of 1099917225 in words is "one billion, ninety-nine million, nine hundred seventeen thousand, two hundred twenty-five".