43161023549 has 4 divisors (see below), whose sum is σ = 49326884064. Its totient is φ = 36995163036.

The previous prime is 43161023509. The next prime is 43161023603. The reversal of 43161023549 is 94532016134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43161023549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43161023509) 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 in 3 ways as a sum of consecutive naturals, for example, 3082930247 + ... + 3082930260.

It is an arithmetic number, because the mean of its divisors is an integer number (12331721016).

Almost surely, 2^43161023549 is an apocalyptic number.

It is an amenable number.

43161023549 is a deficient number, since it is larger than the sum of its proper divisors (6165860515).

43161023549 is an equidigital number, since it uses as much as digits as its factorization.

43161023549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6165860514.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 43161023549 in words is "forty-three billion, one hundred sixty-one million, twenty-three thousand, five hundred forty-nine".