43951440641 has 2 divisors, whose sum is σ = 43951440642. Its totient is φ = 43951440640.

The previous prime is 43951440629. The next prime is 43951440647. The reversal of 43951440641 is 14604415934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43647984241 + 303456400 = 208921^2 + 17420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43951440641 is a prime.

It is not a weakly prime, because it can be changed into another prime (43951440647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21975720320 + 21975720321.

It is an arithmetic number, because the mean of its divisors is an integer number (21975720321).

Almost surely, 2^43951440641 is an apocalyptic number.

It is an amenable number.

43951440641 is a deficient number, since it is larger than the sum of its proper divisors (1).

43951440641 is an equidigital number, since it uses as much as digits as its factorization.

43951440641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 43951440641 in words is "forty-three billion, nine hundred fifty-one million, four hundred forty thousand, six hundred forty-one".