40661281 has 2 divisors, whose sum is σ = 40661282. Its totient is φ = 40661280.

The previous prime is 40661227. The next prime is 40661293. The reversal of 40661281 is 18216604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36000000 + 4661281 = 6000^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 40661281 - 2¹¹ = 40659233 is a prime.

It is a super-2 number, since 2×40661281² = 3306679545121922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40631281) 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, 20330640 + 20330641.

It is an arithmetic number, because the mean of its divisors is an integer number (20330641).

Almost surely, 2^40661281 is an apocalyptic number.

It is an amenable number.

40661281 is a deficient number, since it is larger than the sum of its proper divisors (1).

40661281 is an equidigital number, since it uses as much as digits as its factorization.

40661281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 40661281 is about 6376.6198726284. The cubic root of 40661281 is about 343.8695224701.

Adding to 40661281 its reverse (18216604), we get a palindrome (58877885).

The spelling of 40661281 in words is "forty million, six hundred sixty-one thousand, two hundred eighty-one".