165261313 has 4 divisors (see below), whose sum is σ = 188870080. Its totient is φ = 141652548.

The previous prime is 165261311. The next prime is 165261359. The reversal of 165261313 is 313162561.

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 165261313 - 2¹ = 165261311 is a prime.

It is a super-2 number, since 2×165261313² = 54622603148967938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165261311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11804373 + ... + 11804386.

It is an arithmetic number, because the mean of its divisors is an integer number (47217520).

Almost surely, 2^165261313 is an apocalyptic number.

It is an amenable number.

165261313 is a deficient number, since it is larger than the sum of its proper divisors (23608767).

165261313 is an equidigital number, since it uses as much as digits as its factorization.

165261313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23608766.

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

The square root of 165261313 is about 12855.4001493536. The cubic root of 165261313 is about 548.7700482330.

The spelling of 165261313 in words is "one hundred sixty-five million, two hundred sixty-one thousand, three hundred thirteen".