40520281 has 2 divisors, whose sum is σ = 40520282. Its totient is φ = 40520280.

The previous prime is 40520267. The next prime is 40520309. The reversal of 40520281 is 18202504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40513225 + 7056 = 6365^2 + 84^2 .

It is a cyclic number.

It is not a de Polignac number, because 40520281 - 2⁷ = 40520153 is a prime.

It is a super-2 number, since 2×40520281² = 3283786344637922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40520261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20260140 + 20260141.

It is an arithmetic number, because the mean of its divisors is an integer number (20260141).

Almost surely, 2^40520281 is an apocalyptic number.

It is an amenable number.

40520281 is a deficient number, since it is larger than the sum of its proper divisors (1).

40520281 is an equidigital number, since it uses as much as digits as its factorization.

40520281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 40520281 is about 6365.5542570934. The cubic root of 40520281 is about 343.4715865324.

Adding to 40520281 its reverse (18202504), we get a palindrome (58722785).

The spelling of 40520281 in words is "forty million, five hundred twenty thousand, two hundred eighty-one".