43261289 has 2 divisors, whose sum is σ = 43261290. Its totient is φ = 43261288.

The previous prime is 43261279. The next prime is 43261319. The reversal of 43261289 is 98216234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40960000 + 2301289 = 6400^2 + 1517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43261289 is a prime.

It is not a weakly prime, because it can be changed into another prime (43261279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21630644 + 21630645.

It is an arithmetic number, because the mean of its divisors is an integer number (21630645).

Almost surely, 2^43261289 is an apocalyptic number.

It is an amenable number.

43261289 is a deficient number, since it is larger than the sum of its proper divisors (1).

43261289 is an equidigital number, since it uses as much as digits as its factorization.

43261289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 43261289 is about 6577.3314497598. The cubic root of 43261289 is about 351.0479854743.

The spelling of 43261289 in words is "forty-three million, two hundred sixty-one thousand, two hundred eighty-nine".