43091937641 has 2 divisors, whose sum is σ = 43091937642. Its totient is φ = 43091937640.

The previous prime is 43091937619. The next prime is 43091937677. The reversal of 43091937641 is 14673919034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25516867600 + 17575070041 = 159740^2 + 132571^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43091937641 is a prime.

It is not a weakly prime, because it can be changed into another prime (43091937601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21545968820 + 21545968821.

It is an arithmetic number, because the mean of its divisors is an integer number (21545968821).

Almost surely, 2^43091937641 is an apocalyptic number.

It is an amenable number.

43091937641 is a deficient number, since it is larger than the sum of its proper divisors (1).

43091937641 is an equidigital number, since it uses as much as digits as its factorization.

43091937641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 43091937641 in words is "forty-three billion, ninety-one million, nine hundred thirty-seven thousand, six hundred forty-one".