43121099 has 4 divisors (see below), whose sum is σ = 49281264. Its totient is φ = 36960936.

The previous prime is 43121087. The next prime is 43121101. The reversal of 43121099 is 99012134.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 43121099 - 2⁸ = 43120843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43121009) 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, 3080072 + ... + 3080085.

It is an arithmetic number, because the mean of its divisors is an integer number (12320316).

Almost surely, 2^43121099 is an apocalyptic number.

43121099 is a deficient number, since it is larger than the sum of its proper divisors (6160165).

43121099 is an equidigital number, since it uses as much as digits as its factorization.

43121099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6160164.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 43121099 is about 6566.6657445008. The cubic root of 43121099 is about 350.6683799539.

The spelling of 43121099 in words is "forty-three million, one hundred twenty-one thousand, ninety-nine".