40040531 has 2 divisors, whose sum is σ = 40040532. Its totient is φ = 40040530.

The previous prime is 40040513. The next prime is 40040537. The reversal of 40040531 is 13504004.

40040531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (40040513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40040531 - 2²² = 35846227 is a prime.

It is a super-2 number, since 2×40040531² = 3206488245523922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40040537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20020265 + 20020266.

It is an arithmetic number, because the mean of its divisors is an integer number (20020266).

Almost surely, 2^40040531 is an apocalyptic number.

40040531 is a deficient number, since it is larger than the sum of its proper divisors (1).

40040531 is an equidigital number, since it uses as much as digits as its factorization.

40040531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 40040531 is about 6327.7587659455. The cubic root of 40040531 is about 342.1106620674.

Adding to 40040531 its reverse (13504004), we get a palindrome (53544535).

The spelling of 40040531 in words is "forty million, forty thousand, five hundred thirty-one".