40090291 has 2 divisors, whose sum is σ = 40090292. Its totient is φ = 40090290.

The previous prime is 40090289. The next prime is 40090397. The reversal of 40090291 is 19209004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40090291 - 2¹ = 40090289 is a prime.

Together with 40090289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40090231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20045145 + 20045146.

It is an arithmetic number, because the mean of its divisors is an integer number (20045146).

Almost surely, 2^40090291 is an apocalyptic number.

40090291 is a deficient number, since it is larger than the sum of its proper divisors (1).

40090291 is an equidigital number, since it uses as much as digits as its factorization.

40090291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 40090291 is about 6331.6894270013. The cubic root of 40090291 is about 342.2523216898.

Adding to 40090291 its reverse (19209004), we get a palindrome (59299295).

The spelling of 40090291 in words is "forty million, ninety thousand, two hundred ninety-one".