40533581 has 4 divisors (see below), whose sum is σ = 44218464. Its totient is φ = 36848700.

The previous prime is 40533569. The next prime is 40533583. The reversal of 40533581 is 18533504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40533581 is a prime.

It is a super-2 number, since 2×40533581² = 3285942377367122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40533583) 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, 1842425 + ... + 1842446.

It is an arithmetic number, because the mean of its divisors is an integer number (11054616).

Almost surely, 2^40533581 is an apocalyptic number.

It is an amenable number.

40533581 is a deficient number, since it is larger than the sum of its proper divisors (3684883).

40533581 is a wasteful number, since it uses less digits than its factorization.

40533581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684882.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 40533581 is about 6366.5988565324. The cubic root of 40533581 is about 343.5091617274.

It can be divided in two parts, 40533 and 581, that added together give a palindrome (41114).

The spelling of 40533581 in words is "forty million, five hundred thirty-three thousand, five hundred eighty-one".