1157444165 has 4 divisors (see below), whose sum is σ = 1388933004. Its totient is φ = 925955328.

The previous prime is 1157444161. The next prime is 1157444177. The reversal of 1157444165 is 5614447511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5614447511 = 10687 ⋅525353.

It can be written as a sum of positive squares in 2 ways, for example, as 748514881 + 408929284 = 27359^2 + 20222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157444165 - 2² = 1157444161 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 (1157444161) 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, 115744412 + ... + 115744421.

It is an arithmetic number, because the mean of its divisors is an integer number (347233251).

Almost surely, 2^1157444165 is an apocalyptic number.

It is an amenable number.

1157444165 is a deficient number, since it is larger than the sum of its proper divisors (231488839).

1157444165 is an equidigital number, since it uses as much as digits as its factorization.

1157444165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231488838.

The product of its digits is 67200, while the sum is 38.

The square root of 1157444165 is about 34021.2310917756. The cubic root of 1157444165 is about 1049.9453229276.

The spelling of 1157444165 in words is "one billion, one hundred fifty-seven million, four hundred forty-four thousand, one hundred sixty-five".