165240437 has 2 divisors, whose sum is σ = 165240438. Its totient is φ = 165240436.

The previous prime is 165240433. The next prime is 165240457. The reversal of 165240437 is 734042561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100180081 + 65060356 = 10009^2 + 8066^2 .

It is a cyclic number.

It is not a de Polignac number, because 165240437 - 2² = 165240433 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165240433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82620218 + 82620219.

It is an arithmetic number, because the mean of its divisors is an integer number (82620219).

Almost surely, 2^165240437 is an apocalyptic number.

It is an amenable number.

165240437 is a deficient number, since it is larger than the sum of its proper divisors (1).

165240437 is an equidigital number, since it uses as much as digits as its factorization.

165240437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 165240437 is about 12854.5881692102. The cubic root of 165240437 is about 548.7469401711.

Adding to 165240437 its reverse (734042561), we get a palindrome (899282998).

The spelling of 165240437 in words is "one hundred sixty-five million, two hundred forty thousand, four hundred thirty-seven".