42956191 has 2 divisors, whose sum is σ = 42956192. Its totient is φ = 42956190.

The previous prime is 42956153. The next prime is 42956201. The reversal of 42956191 is 19165924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42956191 - 2⁷ = 42956063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42956191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42956141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21478095 + 21478096.

It is an arithmetic number, because the mean of its divisors is an integer number (21478096).

Almost surely, 2^42956191 is an apocalyptic number.

42956191 is a deficient number, since it is larger than the sum of its proper divisors (1).

42956191 is an equidigital number, since it uses as much as digits as its factorization.

42956191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 42956191 is about 6554.0972681217. The cubic root of 42956191 is about 350.2207885830.

The spelling of 42956191 in words is "forty-two million, nine hundred fifty-six thousand, one hundred ninety-one".