43173009 has 12 divisors (see below), whose sum is σ = 68030352. Its totient is φ = 26165400.

The previous prime is 43172999. The next prime is 43173019. The reversal of 43173009 is 90037134.

It is an interprime number because it is at equal distance from previous prime (43172999) and next prime (43173019).

It is not a de Polignac number, because 43173009 - 2⁷ = 43172881 is a prime.

It is a super-2 number, since 2×43173009² = 3727817412228162, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43173019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217947 + ... + 218144.

It is an arithmetic number, because the mean of its divisors is an integer number (5669196).

Almost surely, 2^43173009 is an apocalyptic number.

It is an amenable number.

43173009 is a deficient number, since it is larger than the sum of its proper divisors (24857343).

43173009 is a wasteful number, since it uses less digits than its factorization.

43173009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436108 (or 436105 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 43173009 is about 6570.6170943070. The cubic root of 43173009 is about 350.8090372845.

The spelling of 43173009 in words is "forty-three million, one hundred seventy-three thousand, nine".