43581137303689 has 2 divisors, whose sum is σ = 43581137303690. Its totient is φ = 43581137303688.

The previous prime is 43581137303687. The next prime is 43581137303741. The reversal of 43581137303689 is 98630373118534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36270711015289 + 7310426288400 = 6022517^2 + 2703780^2 .

It is a cyclic number.

It is not a de Polignac number, because 43581137303689 - 2¹ = 43581137303687 is a prime.

Together with 43581137303687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43581137303687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21790568651844 + 21790568651845.

It is an arithmetic number, because the mean of its divisors is an integer number (21790568651845).

Almost surely, 2^{43581137303689} is an apocalyptic number.

It is an amenable number.

43581137303689 is a deficient number, since it is larger than the sum of its proper divisors (1).

43581137303689 is an equidigital number, since it uses as much as digits as its factorization.

43581137303689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 61.

The spelling of 43581137303689 in words is "forty-three trillion, five hundred eighty-one billion, one hundred thirty-seven million, three hundred three thousand, six hundred eighty-nine".