40661321 has 2 divisors, whose sum is σ = 40661322. Its totient is φ = 40661320.

The previous prime is 40661317. The next prime is 40661323. The reversal of 40661321 is 12316604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30958096 + 9703225 = 5564^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 40661321 - 2² = 40661317 is a prime.

Together with 40661323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40661323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20330660 + 20330661.

It is an arithmetic number, because the mean of its divisors is an integer number (20330661).

Almost surely, 2^40661321 is an apocalyptic number.

It is an amenable number.

40661321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40661321 is an equidigital number, since it uses as much as digits as its factorization.

40661321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40661321 is about 6376.6230090856. The cubic root of 40661321 is about 343.8696352291.

Adding to 40661321 its reverse (12316604), we get a palindrome (52977925).

The spelling of 40661321 in words is "forty million, six hundred sixty-one thousand, three hundred twenty-one".