40313281 has 2 divisors, whose sum is σ = 40313282. Its totient is φ = 40313280.

The previous prime is 40313267. The next prime is 40313327. The reversal of 40313281 is 18231304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39942400 + 370881 = 6320^2 + 609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40313281 is a prime.

It is a super-2 number, since 2×40313281² = 3250321249969922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40313201) 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 as a sum of consecutive naturals, namely, 20156640 + 20156641.

It is an arithmetic number, because the mean of its divisors is an integer number (20156641).

Almost surely, 2^40313281 is an apocalyptic number.

It is an amenable number.

40313281 is a deficient number, since it is larger than the sum of its proper divisors (1).

40313281 is an equidigital number, since it uses as much as digits as its factorization.

40313281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40313281 is about 6349.2740529922. The cubic root of 40313281 is about 342.8857068051.

Adding to 40313281 its reverse (18231304), we get a palindrome (58544585).

The spelling of 40313281 in words is "forty million, three hundred thirteen thousand, two hundred eighty-one".