40491911 has 2 divisors, whose sum is σ = 40491912. Its totient is φ = 40491910.

The previous prime is 40491881. The next prime is 40491959. The reversal of 40491911 is 11919404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40491911 - 2²² = 36297607 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40491961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20245955 + 20245956.

It is an arithmetic number, because the mean of its divisors is an integer number (20245956).

Almost surely, 2^40491911 is an apocalyptic number.

40491911 is a deficient number, since it is larger than the sum of its proper divisors (1).

40491911 is an equidigital number, since it uses as much as digits as its factorization.

40491911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 40491911 is about 6363.3254670809. The cubic root of 40491911 is about 343.3914080498.

The spelling of 40491911 in words is "forty million, four hundred ninety-one thousand, nine hundred eleven".