40240181 has 2 divisors, whose sum is σ = 40240182. Its totient is φ = 40240180.

The previous prime is 40240171. The next prime is 40240223. The reversal of 40240181 is 18104204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 19945156 = 4505^2 + 4466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40240181 is a prime.

It is a super-2 number, since 2×40240181² = 3238544333825522, 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 (40240171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120090 + 20120091.

It is an arithmetic number, because the mean of its divisors is an integer number (20120091).

Almost surely, 2^40240181 is an apocalyptic number.

It is an amenable number.

40240181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240181 is an equidigital number, since it uses as much as digits as its factorization.

40240181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 40240181 is about 6343.5148774161. The cubic root of 40240181 is about 342.6783300639.

Adding to 40240181 its reverse (18104204), we get a palindrome (58344385).

The spelling of 40240181 in words is "forty million, two hundred forty thousand, one hundred eighty-one".