43021091 has 2 divisors, whose sum is σ = 43021092. Its totient is φ = 43021090.

The previous prime is 43021019. The next prime is 43021103. The reversal of 43021091 is 19012034.

Together with previous prime (43021019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43021091 is a prime.

It is a Chen prime.

It is equal to p_2605700 and since 43021091 and 2605700 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43021291) 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 as a sum of consecutive naturals, namely, 21510545 + 21510546.

It is an arithmetic number, because the mean of its divisors is an integer number (21510546).

Almost surely, 2^43021091 is an apocalyptic number.

43021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

43021091 is an equidigital number, since it uses as much as digits as its factorization.

43021091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 43021091 is about 6559.0465008262. The cubic root of 43021091 is about 350.3970758767.

The spelling of 43021091 in words is "forty-three million, twenty-one thousand, ninety-one".