165461231 has 4 divisors (see below), whose sum is σ = 178189032. Its totient is φ = 152733432.

The previous prime is 165461227. The next prime is 165461239. The reversal of 165461231 is 132164561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132164561 = 173 ⋅763957.

It is a cyclic number.

It is not a de Polignac number, because 165461231 - 2² = 165461227 is a prime.

It is a super-2 number, since 2×165461231² = 54754837928070722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165461194 and 165461203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165461239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6363881 + ... + 6363906.

It is an arithmetic number, because the mean of its divisors is an integer number (44547258).

Almost surely, 2^165461231 is an apocalyptic number.

165461231 is a deficient number, since it is larger than the sum of its proper divisors (12727801).

165461231 is a wasteful number, since it uses less digits than its factorization.

165461231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12727800.

The product of its digits is 4320, while the sum is 29.

The square root of 165461231 is about 12863.1734420399. The cubic root of 165461231 is about 548.9912429772.

The spelling of 165461231 in words is "one hundred sixty-five million, four hundred sixty-one thousand, two hundred thirty-one".