43641541 has 2 divisors, whose sum is σ = 43641542. Its totient is φ = 43641540.

The previous prime is 43641539. The next prime is 43641551. The reversal of 43641541 is 14514634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41977441 + 1664100 = 6479^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 43641541 - 2¹ = 43641539 is a prime.

Together with 43641539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43641551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21820770 + 21820771.

It is an arithmetic number, because the mean of its divisors is an integer number (21820771).

Almost surely, 2^43641541 is an apocalyptic number.

It is an amenable number.

43641541 is a deficient number, since it is larger than the sum of its proper divisors (1).

43641541 is an equidigital number, since it uses as much as digits as its factorization.

43641541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 43641541 is about 6606.1744603061. The cubic root of 43641541 is about 352.0735173794.

The spelling of 43641541 in words is "forty-three million, six hundred forty-one thousand, five hundred forty-one".