165115243 has 4 divisors (see below), whose sum is σ = 166817560. Its totient is φ = 163412928.

The previous prime is 165115219. The next prime is 165115267. The reversal of 165115243 is 342511561.

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

It is an interprime number because it is at equal distance from previous prime (165115219) and next prime (165115267).

It is a cyclic number.

It is not a de Polignac number, because 165115243 - 2¹³ = 165107051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165115043) 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, 851013 + ... + 851206.

It is an arithmetic number, because the mean of its divisors is an integer number (41704390).

Almost surely, 2^165115243 is an apocalyptic number.

165115243 is a deficient number, since it is larger than the sum of its proper divisors (1702317).

165115243 is an equidigital number, since it uses as much as digits as its factorization.

165115243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702316.

The product of its digits is 3600, while the sum is 28.

The square root of 165115243 is about 12849.7176233566. The cubic root of 165115243 is about 548.6083195786.

The spelling of 165115243 in words is "one hundred sixty-five million, one hundred fifteen thousand, two hundred forty-three".