40556081 has 4 divisors (see below), whose sum is σ = 40624164. Its totient is φ = 40488000.

The previous prime is 40556071. The next prime is 40556111. The reversal of 40556081 is 18065504.

It is a happy number.

40556081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37405456 + 3150625 = 6116^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 40556081 - 2⁶ = 40556017 is a prime.

It is a super-2 number, since 2×40556081² = 3289591412157122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40556071) 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 in 3 ways as a sum of consecutive naturals, for example, 33140 + ... + 34341.

It is an arithmetic number, because the mean of its divisors is an integer number (10156041).

Almost surely, 2^40556081 is an apocalyptic number.

It is an amenable number.

40556081 is a deficient number, since it is larger than the sum of its proper divisors (68083).

40556081 is an equidigital number, since it uses as much as digits as its factorization.

40556081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68082.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 40556081 is about 6368.3656459095. The cubic root of 40556081 is about 343.5727100766.

The spelling of 40556081 in words is "forty million, five hundred fifty-six thousand, eighty-one".