40319281 has 2 divisors, whose sum is σ = 40319282. Its totient is φ = 40319280.

The previous prime is 40319261. The next prime is 40319303. The reversal of 40319281 is 18291304.

It is a happy number.

40319281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36481600 + 3837681 = 6040^2 + 1959^2 .

It is a cyclic number.

It is not a de Polignac number, because 40319281 - 2⁵ = 40319249 is a prime.

It is a super-2 number, since 2×40319281² = 3251288840713922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40319261) 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 as a sum of consecutive naturals, namely, 20159640 + 20159641.

It is an arithmetic number, because the mean of its divisors is an integer number (20159641).

Almost surely, 2^40319281 is an apocalyptic number.

It is an amenable number.

40319281 is a deficient number, since it is larger than the sum of its proper divisors (1).

40319281 is an equidigital number, since it uses as much as digits as its factorization.

40319281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 40319281 is about 6349.7465303743. The cubic root of 40319281 is about 342.9027170155.

The spelling of 40319281 in words is "forty million, three hundred nineteen thousand, two hundred eighty-one".