9161361225 has 63 divisors (see below), whose sum is σ = 17056397253. Its totient is φ = 4879167840.

The previous prime is 9161361137. The next prime is 9161361257. The reversal of 9161361225 is 5221631619.

The square root of 9161361225 is 95715.

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

9161361225 is a `hidden beast` number, since 9 + 1 + 6 + 13 + 612 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2530190601 + 6631170624 = 50301^2 + 81432^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9161361225 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9161361225.

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 12921171 + ... + 12921879.

Almost surely, 2^9161361225 is an apocalyptic number.

9161361225 is the 95715-th square number.

9161361225 is the 47858-th centered octagonal number.

It is an amenable number.

9161361225 is a deficient number, since it is larger than the sum of its proper divisors (7895036028).

9161361225 is an frugal number, since it uses more digits than its factorization.

9161361225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446 (or 717 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The cubic root of 9161361225 is about 2092.4415523043.

Multiplying 9161361225 by its sum of digits (36), we get a square (329809004100 = 574290²).

The spelling of 9161361225 in words is "nine billion, one hundred sixty-one million, three hundred sixty-one thousand, two hundred twenty-five".