43501921 has 2 divisors, whose sum is σ = 43501922. Its totient is φ = 43501920.

The previous prime is 43501889. The next prime is 43501933. The reversal of 43501921 is 12910534.

43501921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39237696 + 4264225 = 6264^2 + 2065^2 .

It is a cyclic number.

It is not a de Polignac number, because 43501921 - 2⁵ = 43501889 is a prime.

It is not a weakly prime, because it can be changed into another prime (43501951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21750960 + 21750961.

It is an arithmetic number, because the mean of its divisors is an integer number (21750961).

Almost surely, 2^43501921 is an apocalyptic number.

It is an amenable number.

43501921 is a deficient number, since it is larger than the sum of its proper divisors (1).

43501921 is an equidigital number, since it uses as much as digits as its factorization.

43501921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 43501921 is about 6595.5986081629. The cubic root of 43501921 is about 351.6976597448.

The spelling of 43501921 in words is "forty-three million, five hundred one thousand, nine hundred twenty-one".