40020242191 has 2 divisors, whose sum is σ = 40020242192. Its totient is φ = 40020242190.

The previous prime is 40020242189. The next prime is 40020242221. The reversal of 40020242191 is 19124202004.

40020242191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40020242191 - 2¹ = 40020242189 is a prime.

Together with 40020242189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40020242131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010121095 + 20010121096.

It is an arithmetic number, because the mean of its divisors is an integer number (20010121096).

Almost surely, 2^40020242191 is an apocalyptic number.

40020242191 is a deficient number, since it is larger than the sum of its proper divisors (1).

40020242191 is an equidigital number, since it uses as much as digits as its factorization.

40020242191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 40020242191 its reverse (19124202004), we get a palindrome (59144444195).

The spelling of 40020242191 in words is "forty billion, twenty million, two hundred forty-two thousand, one hundred ninety-one".