40042043231 has 2 divisors, whose sum is σ = 40042043232. Its totient is φ = 40042043230.

The previous prime is 40042043227. The next prime is 40042043267. The reversal of 40042043231 is 13234024004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40042043231 - 2² = 40042043227 is a prime.

It is a super-2 number, since 2×40042043231² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 40042043197 and 40042043206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40042043281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021021615 + 20021021616.

It is an arithmetic number, because the mean of its divisors is an integer number (20021021616).

Almost surely, 2^40042043231 is an apocalyptic number.

40042043231 is a deficient number, since it is larger than the sum of its proper divisors (1).

40042043231 is an equidigital number, since it uses as much as digits as its factorization.

40042043231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 40042043231 its reverse (13234024004), we get a palindrome (53276067235).

The spelling of 40042043231 in words is "forty billion, forty-two million, forty-three thousand, two hundred thirty-one".