40231043521 has 2 divisors, whose sum is σ = 40231043522. Its totient is φ = 40231043520.

The previous prime is 40231043519. The next prime is 40231043543. The reversal of 40231043521 is 12534013204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40134512896 + 96530625 = 200336^2 + 9825^2 .

It is a cyclic number.

It is not a de Polignac number, because 40231043521 - 2¹ = 40231043519 is a prime.

Together with 40231043519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40231043591) 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, 20115521760 + 20115521761.

It is an arithmetic number, because the mean of its divisors is an integer number (20115521761).

Almost surely, 2^40231043521 is an apocalyptic number.

It is an amenable number.

40231043521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40231043521 is an equidigital number, since it uses as much as digits as its factorization.

40231043521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 40231043521 its reverse (12534013204), we get a palindrome (52765056725).

The spelling of 40231043521 in words is "forty billion, two hundred thirty-one million, forty-three thousand, five hundred twenty-one".