43981541 has 2 divisors, whose sum is σ = 43981542. Its totient is φ = 43981540.

The previous prime is 43981537. The next prime is 43981559. The reversal of 43981541 is 14518934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35402500 + 8579041 = 5950^2 + 2929^2 .

It is a cyclic number.

It is not a de Polignac number, because 43981541 - 2² = 43981537 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43981501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21990770 + 21990771.

It is an arithmetic number, because the mean of its divisors is an integer number (21990771).

Almost surely, 2^43981541 is an apocalyptic number.

It is an amenable number.

43981541 is a deficient number, since it is larger than the sum of its proper divisors (1).

43981541 is an equidigital number, since it uses as much as digits as its factorization.

43981541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 43981541 is about 6631.8580352719. The cubic root of 43981541 is about 352.9854579152.

The spelling of 43981541 in words is "forty-three million, nine hundred eighty-one thousand, five hundred forty-one".