43691149 has 2 divisors, whose sum is σ = 43691150. Its totient is φ = 43691148.

The previous prime is 43691143. The next prime is 43691161. The reversal of 43691149 is 94119634.

43691149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 3305124 = 6355^2 + 1818^2 .

It is a cyclic number.

It is not a de Polignac number, because 43691149 - 2⁹ = 43690637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43691143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21845574 + 21845575.

It is an arithmetic number, because the mean of its divisors is an integer number (21845575).

Almost surely, 2^43691149 is an apocalyptic number.

It is an amenable number.

43691149 is a deficient number, since it is larger than the sum of its proper divisors (1).

43691149 is an equidigital number, since it uses as much as digits as its factorization.

43691149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 43691149 is about 6609.9280631486. The cubic root of 43691149 is about 352.2068692959.

The spelling of 43691149 in words is "forty-three million, six hundred ninety-one thousand, one hundred forty-nine".