165913 has 4 divisors (see below), whose sum is σ = 181008. Its totient is φ = 150820.

The previous prime is 165901. The next prime is 165931. The reversal of 165913 is 319561.

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 165913 - 2¹³ = 157721 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (165983) 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, 7531 + ... + 7552.

It is an arithmetic number, because the mean of its divisors is an integer number (45252).

2¹⁶⁵⁹¹³ is an apocalyptic number.

It is an amenable number.

165913 is a deficient number, since it is larger than the sum of its proper divisors (15095).

165913 is a wasteful number, since it uses less digits than its factorization.

165913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15094.

The product of its digits is 810, while the sum is 25.

The square root of 165913 is about 407.3241952057. The cubic root of 165913 is about 54.9490437138.

It can be divided in two parts, 16 and 5913, that added together give a square (5929 = 77²).

The spelling of 165913 in words is "one hundred sixty-five thousand, nine hundred thirteen".