1165765541 has 4 divisors (see below), whose sum is σ = 1166146752. Its totient is φ = 1165384332.

The previous prime is 1165765529. The next prime is 1165765589. The reversal of 1165765541 is 1455675611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1455675611 = 13 ⋅111975047.

It is a cyclic number.

It is not a de Polignac number, because 1165765541 - 2⁶ = 1165765477 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 (1165765141) 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, 185981 + ... + 192146.

It is an arithmetic number, because the mean of its divisors is an integer number (291536688).

Almost surely, 2^1165765541 is an apocalyptic number.

It is an amenable number.

1165765541 is a deficient number, since it is larger than the sum of its proper divisors (381211).

1165765541 is an equidigital number, since it uses as much as digits as its factorization.

1165765541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381210.

The product of its digits is 126000, while the sum is 41.

The square root of 1165765541 is about 34143.3088759716. The cubic root of 1165765541 is about 1052.4554900938.

The spelling of 1165765541 in words is "one billion, one hundred sixty-five million, seven hundred sixty-five thousand, five hundred forty-one".