40531431 has 4 divisors (see below), whose sum is σ = 54041912. Its totient is φ = 27020952.

The previous prime is 40531429. The next prime is 40531433. The reversal of 40531431 is 13413504.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (40531429) and next prime (40531433).

It is not a de Polignac number, because 40531431 - 2¹ = 40531429 is a prime.

It is a super-2 number, since 2×40531431² = 3285593797815522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40531398 and 40531407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40531433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6755236 + ... + 6755241.

It is an arithmetic number, because the mean of its divisors is an integer number (13510478).

Almost surely, 2^40531431 is an apocalyptic number.

40531431 is a deficient number, since it is larger than the sum of its proper divisors (13510481).

40531431 is a wasteful number, since it uses less digits than its factorization.

40531431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13510480.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 40531431 is about 6366.4300043274. The cubic root of 40531431 is about 343.5030880988.

Adding to 40531431 its reverse (13413504), we get a palindrome (53944935).

The spelling of 40531431 in words is "forty million, five hundred thirty-one thousand, four hundred thirty-one".