165312361 has 4 divisors (see below), whose sum is σ = 165844224. Its totient is φ = 164780500.

The previous prime is 165312359. The next prime is 165312401. The reversal of 165312361 is 163213561.

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 165312361 - 2¹ = 165312359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165312311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265465 + ... + 266086.

It is an arithmetic number, because the mean of its divisors is an integer number (41461056).

Almost surely, 2^165312361 is an apocalyptic number.

It is an amenable number.

165312361 is a deficient number, since it is larger than the sum of its proper divisors (531863).

165312361 is an equidigital number, since it uses as much as digits as its factorization.

165312361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531862.

The product of its digits is 3240, while the sum is 28.

The square root of 165312361 is about 12857.3854651714. The cubic root of 165312361 is about 548.8265460888.

The spelling of 165312361 in words is "one hundred sixty-five million, three hundred twelve thousand, three hundred sixty-one".