40431045440521 has 4 divisors (see below), whose sum is σ = 41116317397200. Its totient is φ = 39745773483844.

The previous prime is 40431045440497. The next prime is 40431045440549. The reversal of 40431045440521 is 12504454013404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40431045440521 - 2¹⁹ = 40431044916233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40431045440581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342635978251 + ... + 342635978368.

It is an arithmetic number, because the mean of its divisors is an integer number (10279079349300).

Almost surely, 2^{40431045440521} is an apocalyptic number.

It is an amenable number.

40431045440521 is a deficient number, since it is larger than the sum of its proper divisors (685271956679).

40431045440521 is an equidigital number, since it uses as much as digits as its factorization.

40431045440521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685271956678.

The product of its (nonzero) digits is 153600, while the sum is 37.

Adding to 40431045440521 its reverse (12504454013404), we get a palindrome (52935499453925).

The spelling of 40431045440521 in words is "forty trillion, four hundred thirty-one billion, forty-five million, four hundred forty thousand, five hundred twenty-one".