42500191 has 2 divisors, whose sum is σ = 42500192. Its totient is φ = 42500190.

The previous prime is 42500179. The next prime is 42500197. The reversal of 42500191 is 19100524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42500191 - 2²¹ = 40403039 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42500197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21250095 + 21250096.

It is an arithmetic number, because the mean of its divisors is an integer number (21250096).

Almost surely, 2^42500191 is an apocalyptic number.

42500191 is a deficient number, since it is larger than the sum of its proper divisors (1).

42500191 is an equidigital number, since it uses as much as digits as its factorization.

42500191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 42500191 is about 6519.2170542175. The cubic root of 42500191 is about 348.9771251253.

The spelling of 42500191 in words is "forty-two million, five hundred thousand, one hundred ninety-one".