40321291 has 2 divisors, whose sum is σ = 40321292. Its totient is φ = 40321290.

The previous prime is 40321289. The next prime is 40321313. The reversal of 40321291 is 19212304.

It is an a-pointer prime, because the next prime (40321313) can be obtained adding 40321291 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40321291 - 2¹ = 40321289 is a prime.

Together with 40321289, 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 (40321201) 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, 20160645 + 20160646.

It is an arithmetic number, because the mean of its divisors is an integer number (20160646).

Almost surely, 2^40321291 is an apocalyptic number.

40321291 is a deficient number, since it is larger than the sum of its proper divisors (1).

40321291 is an equidigital number, since it uses as much as digits as its factorization.

40321291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 40321291 is about 6349.9048024360. The cubic root of 40321291 is about 342.9084150587.

Adding to 40321291 its reverse (19212304), we get a palindrome (59533595).

The spelling of 40321291 in words is "forty million, three hundred twenty-one thousand, two hundred ninety-one".