42102191 has 2 divisors, whose sum is σ = 42102192. Its totient is φ = 42102190.

The previous prime is 42102187. The next prime is 42102199. The reversal of 42102191 is 19120124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42102191 - 2² = 42102187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42102199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21051095 + 21051096.

It is an arithmetic number, because the mean of its divisors is an integer number (21051096).

Almost surely, 2^42102191 is an apocalyptic number.

42102191 is a deficient number, since it is larger than the sum of its proper divisors (1).

42102191 is an equidigital number, since it uses as much as digits as its factorization.

42102191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 42102191 is about 6488.6201152479. The cubic root of 42102191 is about 347.8843557039.

The spelling of 42102191 in words is "forty-two million, one hundred two thousand, one hundred ninety-one".