1165021027 has 4 divisors (see below), whose sum is σ = 1193436216. Its totient is φ = 1136605840.

The previous prime is 1165021019. The next prime is 1165021051. The reversal of 1165021027 is 7201205611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1165021027 - 2³ = 1165021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1165020992 and 1165021010.

It is not an unprimeable number, because it can be changed into a prime (1165021427) 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, 14207533 + ... + 14207614.

It is an arithmetic number, because the mean of its divisors is an integer number (298359054).

Almost surely, 2^1165021027 is an apocalyptic number.

1165021027 is a deficient number, since it is larger than the sum of its proper divisors (28415189).

1165021027 is an equidigital number, since it uses as much as digits as its factorization.

1165021027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28415188.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1165021027 is about 34132.4043542203. The cubic root of 1165021027 is about 1052.2313927985.

Adding to 1165021027 its reverse (7201205611), we get a palindrome (8366226638).

The spelling of 1165021027 in words is "one billion, one hundred sixty-five million, twenty-one thousand, twenty-seven".