165335431 has 16 divisors (see below), whose sum is σ = 180799488. Its totient is φ = 150717600.

The previous prime is 165335407. The next prime is 165335441. The reversal of 165335431 is 134533561.

It is a cyclic number.

It is not a de Polignac number, because 165335431 - 2²¹ = 163238279 is a prime.

It is a super-2 number, since 2×165335431² = 54671609487911522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165335393 and 165335402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165335441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46041 + ... + 49501.

It is an arithmetic number, because the mean of its divisors is an integer number (11299968).

Almost surely, 2^165335431 is an apocalyptic number.

165335431 is a deficient number, since it is larger than the sum of its proper divisors (15464057).

165335431 is a wasteful number, since it uses less digits than its factorization.

165335431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3582.

The product of its digits is 16200, while the sum is 31.

The square root of 165335431 is about 12858.2825836112. The cubic root of 165335431 is about 548.8520752132.

Adding to 165335431 its reverse (134533561), we get a palindrome (299868992).

The spelling of 165335431 in words is "one hundred sixty-five million, three hundred thirty-five thousand, four hundred thirty-one".