40531 has 2 divisors, whose sum is σ = 40532. Its totient is φ = 40530.

The previous prime is 40529. The next prime is 40543. The reversal of 40531 is 13504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40531 - 2¹ = 40529 is a prime.

It is a super-2 number, since 2×40531² = 3285523922, which contains 22 as substring.

Together with 40529, it forms a pair of twin primes.

It is a plaindrome in base 13.

It is a zygodrome in base 5.

It is not a weakly prime, because it can be changed into another prime (40591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20265 + 20266.

It is an arithmetic number, because the mean of its divisors is an integer number (20266).

2⁴⁰⁵³¹ is an apocalyptic number.

40531 is a deficient number, since it is larger than the sum of its proper divisors (1).

40531 is an equidigital number, since it uses as much as digits as its factorization.

40531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 40531 is about 201.3231233614. The cubic root of 40531 is about 34.3501870522.

The spelling of 40531 in words is "forty thousand, five hundred thirty-one".