43566121 has 4 divisors (see below), whose sum is σ = 46128852. Its totient is φ = 41003392.

The previous prime is 43566113. The next prime is 43566143. The reversal of 43566121 is 12166534.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15093225 + 28472896 = 3885^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 43566121 - 2³ = 43566113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43566121.

It is not an unprimeable number, because it can be changed into a prime (43566161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281340 + ... + 1281373.

It is an arithmetic number, because the mean of its divisors is an integer number (11532213).

Almost surely, 2^43566121 is an apocalyptic number.

It is an amenable number.

43566121 is a deficient number, since it is larger than the sum of its proper divisors (2562731).

43566121 is a wasteful number, since it uses less digits than its factorization.

43566121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562730.

The product of its digits is 4320, while the sum is 28.

The square root of 43566121 is about 6600.4636958323. The cubic root of 43566121 is about 351.8705861429.

The spelling of 43566121 in words is "forty-three million, five hundred sixty-six thousand, one hundred twenty-one".