43013309 has 2 divisors, whose sum is σ = 43013310. Its totient is φ = 43013308.

The previous prime is 43013237. The next prime is 43013317. The reversal of 43013309 is 90331034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32741284 + 10272025 = 5722^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 43013309 - 2⁸ = 43013053 is a prime.

It is a super-2 number, since 2×43013309² = 3700289502258962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43013329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21506654 + 21506655.

It is an arithmetic number, because the mean of its divisors is an integer number (21506655).

Almost surely, 2^43013309 is an apocalyptic number.

It is an amenable number.

43013309 is a deficient number, since it is larger than the sum of its proper divisors (1).

43013309 is an equidigital number, since it uses as much as digits as its factorization.

43013309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 43013309 is about 6558.4532475272. The cubic root of 43013309 is about 350.3759470581.

The spelling of 43013309 in words is "forty-three million, thirteen thousand, three hundred nine".