40633181 has 2 divisors, whose sum is σ = 40633182. Its totient is φ = 40633180.

The previous prime is 40633171. The next prime is 40633183. The reversal of 40633181 is 18133604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35593156 + 5040025 = 5966^2 + 2245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40633181 is a prime.

It is a super-2 number, since 2×40633181² = 3302110796357522, which contains 22 as substring.

Together with 40633183, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40633181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40633183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20316590 + 20316591.

It is an arithmetic number, because the mean of its divisors is an integer number (20316591).

Almost surely, 2^40633181 is an apocalyptic number.

It is an amenable number.

40633181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40633181 is an equidigital number, since it uses as much as digits as its factorization.

40633181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40633181 is about 6374.4161301252. The cubic root of 40633181 is about 343.7902909908.

Adding to 40633181 its reverse (18133604), we get a palindrome (58766785).

The spelling of 40633181 in words is "forty million, six hundred thirty-three thousand, one hundred eighty-one".