165241543 has 2 divisors, whose sum is σ = 165241544. Its totient is φ = 165241542.

The previous prime is 165241541. The next prime is 165241553. The reversal of 165241543 is 345142561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165241543 - 2¹ = 165241541 is a prime.

Together with 165241541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165241541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82620771 + 82620772.

It is an arithmetic number, because the mean of its divisors is an integer number (82620772).

Almost surely, 2^165241543 is an apocalyptic number.

165241543 is a deficient number, since it is larger than the sum of its proper divisors (1).

165241543 is an equidigital number, since it uses as much as digits as its factorization.

165241543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 165241543 is about 12854.6311887973. The cubic root of 165241543 is about 548.7481644734.

The spelling of 165241543 in words is "one hundred sixty-five million, two hundred forty-one thousand, five hundred forty-three".