40071181 has 2 divisors, whose sum is σ = 40071182. Its totient is φ = 40071180.

The previous prime is 40071169. The next prime is 40071203. The reversal of 40071181 is 18117004.

It is an a-pointer prime, because the next prime (40071203) can be obtained adding 40071181 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 695556 = 6275^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 40071181 - 2¹⁵ = 40038413 is a prime.

It is a super-2 number, since 2×40071181² = 3211399093469522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40071121) 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, 20035590 + 20035591.

It is an arithmetic number, because the mean of its divisors is an integer number (20035591).

Almost surely, 2^40071181 is an apocalyptic number.

It is an amenable number.

40071181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40071181 is an equidigital number, since it uses as much as digits as its factorization.

40071181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 40071181 is about 6330.1801712116. The cubic root of 40071181 is about 342.1979321173.

Adding to 40071181 its reverse (18117004), we get a palindrome (58188185).

The spelling of 40071181 in words is "forty million, seventy-one thousand, one hundred eighty-one".