40443231431 has 2 divisors, whose sum is σ = 40443231432. Its totient is φ = 40443231430.

The previous prime is 40443231419. The next prime is 40443231449. The reversal of 40443231431 is 13413234404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40443231431 - 2²² = 40439037127 is a prime.

It is a super-2 number, since 2×40443231431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40443231394 and 40443231403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40443231461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221615715 + 20221615716.

It is an arithmetic number, because the mean of its divisors is an integer number (20221615716).

Almost surely, 2^40443231431 is an apocalyptic number.

40443231431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40443231431 is an equidigital number, since it uses as much as digits as its factorization.

40443231431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 40443231431 its reverse (13413234404), we get a palindrome (53856465835).

The spelling of 40443231431 in words is "forty billion, four hundred forty-three million, two hundred thirty-one thousand, four hundred thirty-one".