917181225 has 45 divisors (see below), whose sum is σ = 1701464853. Its totient is φ = 488436480.

The previous prime is 917181217. The next prime is 917181233. The reversal of 917181225 is 522181719.

It is a happy number.

The square root of 917181225 is 30285.

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

917181225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (917181217) and next prime (917181233).

It can be written as a sum of positive squares in 4 ways, for example, as 89813529 + 827367696 = 9477^2 + 28764^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 917181225 - 2³ = 917181217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 917181225.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1362489 + ... + 1363161.

Almost surely, 2^917181225 is an apocalyptic number.

917181225 is the 30285-th square number.

917181225 is the 15143-rd centered octagonal number.

It is an amenable number.

917181225 is a deficient number, since it is larger than the sum of its proper divisors (784283628).

917181225 is an frugal number, since it uses more digits than its factorization.

917181225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 681 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The cubic root of 917181225 is about 971.5945096484.

Multiplying 917181225 by its sum of digits (36), we get a square (33018524100 = 181710²).

The spelling of 917181225 in words is "nine hundred seventeen million, one hundred eighty-one thousand, two hundred twenty-five".