43012891 has 2 divisors, whose sum is σ = 43012892. Its totient is φ = 43012890.

The previous prime is 43012883. The next prime is 43012913. The reversal of 43012891 is 19821034.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43012891 - 2³ = 43012883 is a prime.

It is not a weakly prime, because it can be changed into another prime (43012811) 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, 21506445 + 21506446.

It is an arithmetic number, because the mean of its divisors is an integer number (21506446).

Almost surely, 2^43012891 is an apocalyptic number.

43012891 is a deficient number, since it is larger than the sum of its proper divisors (1).

43012891 is an equidigital number, since it uses as much as digits as its factorization.

43012891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 43012891 is about 6558.4213801798. The cubic root of 43012891 is about 350.3748120790.

The spelling of 43012891 in words is "forty-three million, twelve thousand, eight hundred ninety-one".