40731581 has 8 divisors (see below), whose sum is σ = 44709024. Its totient is φ = 36799920.

The previous prime is 40731577. The next prime is 40731589. The reversal of 40731581 is 18513704.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40731581 - 2² = 40731577 is a prime.

It is a super-2 number, since 2×40731581² = 3318123381519122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40731589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9566 + ... + 13151.

It is an arithmetic number, because the mean of its divisors is an integer number (5588628).

Almost surely, 2^40731581 is an apocalyptic number.

It is an amenable number.

40731581 is a deficient number, since it is larger than the sum of its proper divisors (3977443).

40731581 is a wasteful number, since it uses less digits than its factorization.

40731581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22891.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 40731581 is about 6382.1298169185. The cubic root of 40731581 is about 344.0675823817.

The spelling of 40731581 in words is "forty million, seven hundred thirty-one thousand, five hundred eighty-one".