40523281 has 4 divisors (see below), whose sum is σ = 40541364. Its totient is φ = 40505200.

The previous prime is 40523261. The next prime is 40523317. The reversal of 40523281 is 18232504.

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 21022225 + 19501056 = 4585^2 + 4416^2 .

It is a cyclic number.

It is not a de Polignac number, because 40523281 - 2²⁵ = 6968849 is a prime.

It is a super-2 number, since 2×40523281² = 3284272606009922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40523201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5110 + ... + 10351.

It is an arithmetic number, because the mean of its divisors is an integer number (10135341).

Almost surely, 2^40523281 is an apocalyptic number.

It is an amenable number.

40523281 is a deficient number, since it is larger than the sum of its proper divisors (18083).

40523281 is a wasteful number, since it uses less digits than its factorization.

40523281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18082.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 40523281 is about 6365.7898959988. The cubic root of 40523281 is about 343.4800628584.

Adding to 40523281 its reverse (18232504), we get a palindrome (58755785).

It can be divided in two parts, 40523 and 281, that added together give a palindrome (40804).

The spelling of 40523281 in words is "forty million, five hundred twenty-three thousand, two hundred eighty-one".