40432431521 has 4 divisors (see below), whose sum is σ = 40666145172. Its totient is φ = 40198717872.

The previous prime is 40432431511. The next prime is 40432431539. The reversal of 40432431521 is 12513423404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32847937600 + 7584493921 = 181240^2 + 87089^2 .

It is a cyclic number.

It is not a de Polignac number, because 40432431521 - 2¹⁸ = 40432169377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40432431511) 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, 116856566 + ... + 116856911.

It is an arithmetic number, because the mean of its divisors is an integer number (10166536293).

Almost surely, 2^40432431521 is an apocalyptic number.

It is an amenable number.

40432431521 is a deficient number, since it is larger than the sum of its proper divisors (233713651).

40432431521 is a wasteful number, since it uses less digits than its factorization.

40432431521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233713650.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 40432431521 its reverse (12513423404), we get a palindrome (52945854925).

The spelling of 40432431521 in words is "forty billion, four hundred thirty-two million, four hundred thirty-one thousand, five hundred twenty-one".