40817081 has 2 divisors, whose sum is σ = 40817082. Its totient is φ = 40817080.

The previous prime is 40817059. The next prime is 40817083. The reversal of 40817081 is 18071804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38688400 + 2128681 = 6220^2 + 1459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40817081 is a prime.

It is a super-2 number, since 2×40817081² = 3332068202721122, which contains 22 as substring.

Together with 40817083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40817083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20408540 + 20408541.

It is an arithmetic number, because the mean of its divisors is an integer number (20408541).

Almost surely, 2^40817081 is an apocalyptic number.

It is an amenable number.

40817081 is a deficient number, since it is larger than the sum of its proper divisors (1).

40817081 is an equidigital number, since it uses as much as digits as its factorization.

40817081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 40817081 is about 6388.8246962959. The cubic root of 40817081 is about 344.3081591679.

Adding to 40817081 its reverse (18071804), we get a palindrome (58888885).

The spelling of 40817081 in words is "forty million, eight hundred seventeen thousand, eighty-one".