40605491 has 2 divisors, whose sum is σ = 40605492. Its totient is φ = 40605490.

The previous prime is 40605437. The next prime is 40605497. The reversal of 40605491 is 19450604.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40605491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40605497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20302745 + 20302746.

It is an arithmetic number, because the mean of its divisors is an integer number (20302746).

Almost surely, 2^40605491 is an apocalyptic number.

40605491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40605491 is an equidigital number, since it uses as much as digits as its factorization.

40605491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40605491 is about 6372.2437963405. The cubic root of 40605491 is about 343.7121798170.

The spelling of 40605491 in words is "forty million, six hundred five thousand, four hundred ninety-one".