43481309 has 2 divisors, whose sum is σ = 43481310. Its totient is φ = 43481308.

The previous prime is 43481303. The next prime is 43481351. The reversal of 43481309 is 90318434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41088100 + 2393209 = 6410^2 + 1547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43481309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43481303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21740654 + 21740655.

It is an arithmetic number, because the mean of its divisors is an integer number (21740655).

Almost surely, 2^43481309 is an apocalyptic number.

It is an amenable number.

43481309 is a deficient number, since it is larger than the sum of its proper divisors (1).

43481309 is an equidigital number, since it uses as much as digits as its factorization.

43481309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 43481309 is about 6594.0358658412. The cubic root of 43481309 is about 351.6421040572.

The spelling of 43481309 in words is "forty-three million, four hundred eighty-one thousand, three hundred nine".