43800661 has 2 divisors, whose sum is σ = 43800662. Its totient is φ = 43800660.

The previous prime is 43800629. The next prime is 43800683. The reversal of 43800661 is 16600834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43758225 + 42436 = 6615^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 43800661 - 2⁵ = 43800629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43800061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21900330 + 21900331.

It is an arithmetic number, because the mean of its divisors is an integer number (21900331).

Almost surely, 2^43800661 is an apocalyptic number.

It is an amenable number.

43800661 is a deficient number, since it is larger than the sum of its proper divisors (1).

43800661 is an equidigital number, since it uses as much as digits as its factorization.

43800661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 43800661 is about 6618.2067812966. The cubic root of 43800661 is about 352.5008929776.

The spelling of 43800661 in words is "forty-three million, eight hundred thousand, six hundred sixty-one".