1165541 has 4 divisors (see below), whose sum is σ = 1255212. Its totient is φ = 1075872.

The previous prime is 1165531. The next prime is 1165579. The reversal of 1165541 is 1455611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1455611 = 191 ⋅7621.

It can be written as a sum of positive squares in 2 ways, for example, as 748225 + 417316 = 865^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165541 - 2¹⁴ = 1149157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44816 + ... + 44841.

It is an arithmetic number, because the mean of its divisors is an integer number (313803).

2^1165541 is an apocalyptic number.

It is an amenable number.

1165541 is a deficient number, since it is larger than the sum of its proper divisors (89671).

1165541 is an equidigital number, since it uses as much as digits as its factorization.

1165541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89670.

The product of its digits is 600, while the sum is 23.

The square root of 1165541 is about 1079.6022415686. The cubic root of 1165541 is about 105.2387913732.

The spelling of 1165541 in words is "one million, one hundred sixty-five thousand, five hundred forty-one".