40575581 has 4 divisors (see below), whose sum is σ = 41341212. Its totient is φ = 39809952.

The previous prime is 40575571. The next prime is 40575599. The reversal of 40575581 is 18557504.

40575581 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 11792356 + 28783225 = 3434^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 40575581 - 2¹⁸ = 40313437 is a prime.

It is a super-2 number, since 2×40575581² = 3292755546975122, 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 (40575571) 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, 382736 + ... + 382841.

It is an arithmetic number, because the mean of its divisors is an integer number (10335303).

Almost surely, 2^40575581 is an apocalyptic number.

It is an amenable number.

40575581 is a deficient number, since it is larger than the sum of its proper divisors (765631).

40575581 is an equidigital number, since it uses as much as digits as its factorization.

40575581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765630.

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 40575581 is about 6369.8964669765. The cubic root of 40575581 is about 343.6277663033.

The spelling of 40575581 in words is "forty million, five hundred seventy-five thousand, five hundred eighty-one".