42938191 has 2 divisors, whose sum is σ = 42938192. Its totient is φ = 42938190.

The previous prime is 42938179. The next prime is 42938197. The reversal of 42938191 is 19183924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42938191 - 2⁹ = 42937679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42938191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42938197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21469095 + 21469096.

It is an arithmetic number, because the mean of its divisors is an integer number (21469096).

Almost surely, 2^42938191 is an apocalyptic number.

42938191 is a deficient number, since it is larger than the sum of its proper divisors (1).

42938191 is an equidigital number, since it uses as much as digits as its factorization.

42938191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 42938191 is about 6552.7239374172. The cubic root of 42938191 is about 350.1718638935.

The spelling of 42938191 in words is "forty-two million, nine hundred thirty-eight thousand, one hundred ninety-one".