40249091 has 2 divisors, whose sum is σ = 40249092. Its totient is φ = 40249090.

The previous prime is 40249063. The next prime is 40249127. The reversal of 40249091 is 19094204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40249091 - 2¹⁰ = 40248067 is a prime.

It is not a weakly prime, because it can be changed into another prime (40249021) 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, 20124545 + 20124546.

It is an arithmetic number, because the mean of its divisors is an integer number (20124546).

Almost surely, 2^40249091 is an apocalyptic number.

40249091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40249091 is an equidigital number, since it uses as much as digits as its factorization.

40249091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 40249091 is about 6344.2171305844. The cubic root of 40249091 is about 342.7036201970.

The spelling of 40249091 in words is "forty million, two hundred forty-nine thousand, ninety-one".