165240001 has 4 divisors (see below), whose sum is σ = 165276612. Its totient is φ = 165203392.

The previous prime is 165239989. The next prime is 165240029. The reversal of 165240001 is 100042561.

165240001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 126787600 + 38452401 = 11260^2 + 6201^2 .

It is a cyclic number.

It is not a de Polignac number, because 165240001 - 2⁷ = 165239873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165240041) 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, 10396 + ... + 20941.

It is an arithmetic number, because the mean of its divisors is an integer number (41319153).

Almost surely, 2^165240001 is an apocalyptic number.

It is an amenable number.

165240001 is a deficient number, since it is larger than the sum of its proper divisors (36611).

165240001 is an equidigital number, since it uses as much as digits as its factorization.

165240001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36610.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 165240001 is about 12854.5712102738. The cubic root of 165240001 is about 548.7464575332.

Adding to 165240001 its reverse (100042561), we get a palindrome (265282562).

The spelling of 165240001 in words is "one hundred sixty-five million, two hundred forty thousand, one".