165231424 has 14 divisors (see below), whose sum is σ = 327881234. Its totient is φ = 82615680.

The previous prime is 165231421. The next prime is 165231427. The reversal of 165231424 is 424132561.

It is an interprime number because it is at equal distance from previous prime (165231421) and next prime (165231427).

It can be written as a sum of positive squares in only one way, i.e., 129231424 + 36000000 = 11368^2 + 6000^2 .

It is a junction number, because it is equal to n+sod(n) for n = 165231392 and 165231401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165231421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290807 + ... + 1290934.

Almost surely, 2^165231424 is an apocalyptic number.

It is an amenable number.

165231424 is a deficient number, since it is larger than the sum of its proper divisors (162649810).

165231424 is an equidigital number, since it uses as much as digits as its factorization.

165231424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581753 (or 2581743 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 165231424 is about 12854.2375892155. The cubic root of 165231424 is about 548.7369628996.

Adding to 165231424 its reverse (424132561), we get a palindrome (589363985).

The spelling of 165231424 in words is "one hundred sixty-five million, two hundred thirty-one thousand, four hundred twenty-four".