40431443531 has 2 divisors, whose sum is σ = 40431443532. Its totient is φ = 40431443530.

The previous prime is 40431443497. The next prime is 40431443539. The reversal of 40431443531 is 13534413404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40431443531 is a prime.

It is a super-2 number, since 2×40431443531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40431443539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20215721765 + 20215721766.

It is an arithmetic number, because the mean of its divisors is an integer number (20215721766).

Almost surely, 2^40431443531 is an apocalyptic number.

40431443531 is a deficient number, since it is larger than the sum of its proper divisors (1).

40431443531 is an equidigital number, since it uses as much as digits as its factorization.

40431443531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 40431443531 its reverse (13534413404), we get a palindrome (53965856935).

The spelling of 40431443531 in words is "forty billion, four hundred thirty-one million, four hundred forty-three thousand, five hundred thirty-one".