43161391 has 16 divisors (see below), whose sum is σ = 54028800. Its totient is φ = 33566688.

The previous prime is 43161383. The next prime is 43161401. The reversal of 43161391 is 19316134.

It is a cyclic number.

It is not a de Polignac number, because 43161391 - 2³ = 43161383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43161301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1350 + ... + 9388.

It is an arithmetic number, because the mean of its divisors is an integer number (3376800).

Almost surely, 2^43161391 is an apocalyptic number.

43161391 is a deficient number, since it is larger than the sum of its proper divisors (10867409).

43161391 is a wasteful number, since it uses less digits than its factorization.

43161391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8118.

The product of its digits is 1944, while the sum is 28.

The square root of 43161391 is about 6569.7329473883. The cubic root of 43161391 is about 350.7775665027. Note that the first 3 decimals are identical.

The spelling of 43161391 in words is "forty-three million, one hundred sixty-one thousand, three hundred ninety-one".