1161541565 has 8 divisors (see below), whose sum is σ = 1416700248. Its totient is φ = 913999680.

The previous prime is 1161541543. The next prime is 1161541571. The reversal of 1161541565 is 5651451611.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17884441 + 1143657124 = 4229^2 + 33818^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1161541565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1903862 + ... + 1904471.

It is an arithmetic number, because the mean of its divisors is an integer number (177087531).

Almost surely, 2^1161541565 is an apocalyptic number.

It is an amenable number.

1161541565 is a deficient number, since it is larger than the sum of its proper divisors (255158683).

1161541565 is an equidigital number, since it uses as much as digits as its factorization.

1161541565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808399.

The product of its digits is 18000, while the sum is 35.

The square root of 1161541565 is about 34081.3961715186. The cubic root of 1161541565 is about 1051.1828137092.

The spelling of 1161541565 in words is "one billion, one hundred sixty-one million, five hundred forty-one thousand, five hundred sixty-five".