40549181 has 2 divisors, whose sum is σ = 40549182. Its totient is φ = 40549180.

The previous prime is 40549133. The next prime is 40549193. The reversal of 40549181 is 18194504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 10023556 = 5525^2 + 3166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40549181 is a prime.

It is a super-2 number, since 2×40549181² = 3288472159541522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40549111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20274590 + 20274591.

It is an arithmetic number, because the mean of its divisors is an integer number (20274591).

Almost surely, 2^40549181 is an apocalyptic number.

It is an amenable number.

40549181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40549181 is an equidigital number, since it uses as much as digits as its factorization.

40549181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 40549181 is about 6367.8238826148. The cubic root of 40549181 is about 343.5532244155.

The spelling of 40549181 in words is "forty million, five hundred forty-nine thousand, one hundred eighty-one".