40140181 has 2 divisors, whose sum is σ = 40140182. Its totient is φ = 40140180.

The previous prime is 40140173. The next prime is 40140187. The reversal of 40140181 is 18104104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39564100 + 576081 = 6290^2 + 759^2 .

It is a cyclic number.

It is not a de Polignac number, because 40140181 - 2³ = 40140173 is a prime.

It is a super-2 number, since 2×40140181² = 3222468261425522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40140187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20070090 + 20070091.

It is an arithmetic number, because the mean of its divisors is an integer number (20070091).

Almost surely, 2^40140181 is an apocalyptic number.

It is an amenable number.

40140181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40140181 is an equidigital number, since it uses as much as digits as its factorization.

40140181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 40140181 is about 6335.6279088974. The cubic root of 40140181 is about 342.3942337743.

Adding to 40140181 its reverse (18104104), we get a palindrome (58244285).

The spelling of 40140181 in words is "forty million, one hundred forty thousand, one hundred eighty-one".