42400242191 has 2 divisors, whose sum is σ = 42400242192. Its totient is φ = 42400242190.

The previous prime is 42400242187. The next prime is 42400242217. The reversal of 42400242191 is 19124200424.

42400242191 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 42400242191 - 2² = 42400242187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42400242121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200121095 + 21200121096.

It is an arithmetic number, because the mean of its divisors is an integer number (21200121096).

Almost surely, 2^42400242191 is an apocalyptic number.

42400242191 is a deficient number, since it is larger than the sum of its proper divisors (1).

42400242191 is an equidigital number, since it uses as much as digits as its factorization.

42400242191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 42400242191 in words is "forty-two billion, four hundred million, two hundred forty-two thousand, one hundred ninety-one".