43555121 has 4 divisors (see below), whose sum is σ = 43737600. Its totient is φ = 43372644.

The previous prime is 43555091. The next prime is 43555133. The reversal of 43555121 is 12155534.

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 not a de Polignac number, because 43555121 - 2¹⁰ = 43554097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43555151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90881 + ... + 91358.

It is an arithmetic number, because the mean of its divisors is an integer number (10934400).

Almost surely, 2^43555121 is an apocalyptic number.

It is an amenable number.

43555121 is a deficient number, since it is larger than the sum of its proper divisors (182479).

43555121 is a wasteful number, since it uses less digits than its factorization.

43555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182478.

The product of its digits is 3000, while the sum is 26.

The square root of 43555121 is about 6599.6303684373. The cubic root of 43555121 is about 351.8409690753.

The spelling of 43555121 in words is "forty-three million, five hundred fifty-five thousand, one hundred twenty-one".