165042439 has 2 divisors, whose sum is σ = 165042440. Its totient is φ = 165042438.

The previous prime is 165042431. The next prime is 165042491. The reversal of 165042439 is 934240561.

It is a happy number.

165042439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (934240561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165042439 - 2³ = 165042431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165042431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82521219 + 82521220.

It is an arithmetic number, because the mean of its divisors is an integer number (82521220).

Almost surely, 2^165042439 is an apocalyptic number.

165042439 is a deficient number, since it is larger than the sum of its proper divisors (1).

165042439 is an equidigital number, since it uses as much as digits as its factorization.

165042439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 165042439 is about 12846.8844082914. The cubic root of 165042439 is about 548.5276753951.

The spelling of 165042439 in words is "one hundred sixty-five million, forty-two thousand, four hundred thirty-nine".