43149257 has 2 divisors, whose sum is σ = 43149258. Its totient is φ = 43149256.

The previous prime is 43149233. The next prime is 43149259. The reversal of 43149257 is 75294134.

43149257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28526281 + 14622976 = 5341^2 + 3824^2 .

It is a cyclic number.

It is not a de Polignac number, because 43149257 - 2¹⁸ = 42887113 is a prime.

Together with 43149259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43149259) 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, 21574628 + 21574629.

It is an arithmetic number, because the mean of its divisors is an integer number (21574629).

Almost surely, 2^43149257 is an apocalyptic number.

It is an amenable number.

43149257 is a deficient number, since it is larger than the sum of its proper divisors (1).

43149257 is an equidigital number, since it uses as much as digits as its factorization.

43149257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 43149257 is about 6568.8094050596. The cubic root of 43149257 is about 350.7446919527.

The spelling of 43149257 in words is "forty-three million, one hundred forty-nine thousand, two hundred fifty-seven".