1165506541 has 4 divisors (see below), whose sum is σ = 1165815232. Its totient is φ = 1165197852.

The previous prime is 1165506523. The next prime is 1165506557. The reversal of 1165506541 is 1456055611.

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.

It is a cyclic number.

It is not a de Polignac number, because 1165506541 - 2⁵ = 1165506509 is a prime.

It is a super-2 number, since 2×1165506541² = 2716810994227569362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1165506497 and 1165506506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165506581) 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, 148611 + ... + 156256.

It is an arithmetic number, because the mean of its divisors is an integer number (291453808).

Almost surely, 2^1165506541 is an apocalyptic number.

It is an amenable number.

1165506541 is a deficient number, since it is larger than the sum of its proper divisors (308691).

1165506541 is an equidigital number, since it uses as much as digits as its factorization.

1165506541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308690.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1165506541 is about 34139.5158284355. The cubic root of 1165506541 is about 1052.3775424128.

The spelling of 1165506541 in words is "one billion, one hundred sixty-five million, five hundred six thousand, five hundred forty-one".