43291649 has 2 divisors, whose sum is σ = 43291650. Its totient is φ = 43291648.

The previous prime is 43291643. The next prime is 43291667. The reversal of 43291649 is 94619234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26832400 + 16459249 = 5180^2 + 4057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43291649 is a prime.

It is not a weakly prime, because it can be changed into another prime (43291643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21645824 + 21645825.

It is an arithmetic number, because the mean of its divisors is an integer number (21645825).

Almost surely, 2^43291649 is an apocalyptic number.

It is an amenable number.

43291649 is a deficient number, since it is larger than the sum of its proper divisors (1).

43291649 is an equidigital number, since it uses as much as digits as its factorization.

43291649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 43291649 is about 6579.6389718586. The cubic root of 43291649 is about 351.1300860073.

The spelling of 43291649 in words is "forty-three million, two hundred ninety-one thousand, six hundred forty-nine".