43089257 has 2 divisors, whose sum is σ = 43089258. Its totient is φ = 43089256.

The previous prime is 43089253. The next prime is 43089259. The reversal of 43089257 is 75298034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 8737936 = 5861^2 + 2956^2 .

It is a cyclic number.

It is not a de Polignac number, because 43089257 - 2² = 43089253 is a prime.

Together with 43089259, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43089257.

It is not a weakly prime, because it can be changed into another prime (43089253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21544628 + 21544629.

It is an arithmetic number, because the mean of its divisors is an integer number (21544629).

Almost surely, 2^43089257 is an apocalyptic number.

It is an amenable number.

43089257 is a deficient number, since it is larger than the sum of its proper divisors (1).

43089257 is an equidigital number, since it uses as much as digits as its factorization.

43089257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 43089257 is about 6564.2407786430. The cubic root of 43089257 is about 350.5820437799.

The spelling of 43089257 in words is "forty-three million, eighty-nine thousand, two hundred fifty-seven".