40909090909091 has 4 divisors (see below), whose sum is σ = 40961071965672. Its totient is φ = 40857109852512.

The previous prime is 40909090909079. The next prime is 40909090909111. The reversal of 40909090909091 is 19090909090904.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40909090909091 - 2¹⁴ = 40909090892707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40909090909091.

It is not an unprimeable number, because it can be changed into a prime (40909090909031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25990527110 + ... + 25990528683.

It is an arithmetic number, because the mean of its divisors is an integer number (10240267991418).

Almost surely, 2^{40909090909091} is an apocalyptic number.

40909090909091 is a deficient number, since it is larger than the sum of its proper divisors (51981056581).

40909090909091 is an equidigital number, since it uses as much as digits as its factorization.

40909090909091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51981056580.

The product of its (nonzero) digits is 2125764, while the sum is 59.

Adding to 40909090909091 its reverse (19090909090904), we get a palindrome (59999999999995).

The spelling of 40909090909091 in words is "forty trillion, nine hundred nine billion, ninety million, nine hundred nine thousand, ninety-one".