40531331 has 2 divisors, whose sum is σ = 40531332. Its totient is φ = 40531330.

The previous prime is 40531319. The next prime is 40531333. The reversal of 40531331 is 13313504.

It is a happy number.

40531331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40531331 - 2²² = 36337027 is a prime.

It is a super-2 number, since 2×40531331² = 3285577585263122, which contains 22 as substring.

Together with 40531333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40531333) 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, 20265665 + 20265666.

It is an arithmetic number, because the mean of its divisors is an integer number (20265666).

Almost surely, 2^40531331 is an apocalyptic number.

40531331 is a deficient number, since it is larger than the sum of its proper divisors (1).

40531331 is an equidigital number, since it uses as much as digits as its factorization.

40531331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 40531331 is about 6366.4221506275. The cubic root of 40531331 is about 343.5028055992.

Adding to 40531331 its reverse (13313504), we get a palindrome (53844835).

The spelling of 40531331 in words is "forty million, five hundred thirty-one thousand, three hundred thirty-one".