165242461 has 4 divisors (see below), whose sum is σ = 165274300. Its totient is φ = 165210624.

The previous prime is 165242447. The next prime is 165242503. The reversal of 165242461 is 164242561.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51926436 + 113316025 = 7206^2 + 10645^2 .

It is a cyclic number.

It is not a de Polignac number, because 165242461 - 2²¹ = 163145309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165242401) 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, 6126 + ... + 19183.

It is an arithmetic number, because the mean of its divisors is an integer number (41318575).

Almost surely, 2^165242461 is an apocalyptic number.

It is an amenable number.

165242461 is a deficient number, since it is larger than the sum of its proper divisors (31839).

165242461 is an equidigital number, since it uses as much as digits as its factorization.

165242461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31838.

The product of its digits is 11520, while the sum is 31.

The square root of 165242461 is about 12854.6668957231. Note that the first 3 decimals coincide. The cubic root of 165242461 is about 548.7491806624.

The spelling of 165242461 in words is "one hundred sixty-five million, two hundred forty-two thousand, four hundred sixty-one".