1165881025 has 9 divisors (see below), whose sum is σ = 1445904201. Its totient is φ = 932568240.

The previous prime is 1165881023. The next prime is 1165881047. The reversal of 1165881025 is 5201885611.

The square root of 1165881025 is 34145.

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

It can be written as a sum of positive squares in 4 ways, for example, as 11512449 + 1154368576 = 3393^2 + 33976^2 .

It is not a de Polignac number, because 1165881025 - 2¹ = 1165881023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165881023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 167311 + ... + 174139.

Almost surely, 2^1165881025 is an apocalyptic number.

1165881025 is the 34145-th square number.

1165881025 is the 17073-rd centered octagonal number.

It is an amenable number.

1165881025 is a deficient number, since it is larger than the sum of its proper divisors (280023176).

1165881025 is an frugal number, since it uses more digits than its factorization.

1165881025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13668 (or 6834 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 37.

The cubic root of 1165881025 is about 1052.4902420093.

The spelling of 1165881025 in words is "one billion, one hundred sixty-five million, eight hundred eighty-one thousand, twenty-five".