40864181 has 2 divisors, whose sum is σ = 40864182. Its totient is φ = 40864180.

The previous prime is 40864177. The next prime is 40864199. The reversal of 40864181 is 18146804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30360100 + 10504081 = 5510^2 + 3241^2 .

It is a cyclic number.

It is not a de Polignac number, because 40864181 - 2² = 40864177 is a prime.

It is a super-2 number, since 2×40864181² = 3339762577601522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40860181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20432090 + 20432091.

It is an arithmetic number, because the mean of its divisors is an integer number (20432091).

Almost surely, 2^40864181 is an apocalyptic number.

It is an amenable number.

40864181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40864181 is an equidigital number, since it uses as much as digits as its factorization.

40864181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 40864181 is about 6392.5097575209. The cubic root of 40864181 is about 344.4405439455.

The spelling of 40864181 in words is "forty million, eight hundred sixty-four thousand, one hundred eighty-one".