42819191 has 4 divisors (see below), whose sum is σ = 43545000. Its totient is φ = 42093384.

The previous prime is 42819163. The next prime is 42819199. The reversal of 42819191 is 19191824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42819191 - 2¹⁴ = 42802807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42819199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362816 + ... + 362933.

It is an arithmetic number, because the mean of its divisors is an integer number (10886250).

Almost surely, 2^42819191 is an apocalyptic number.

42819191 is a deficient number, since it is larger than the sum of its proper divisors (725809).

42819191 is an equidigital number, since it uses as much as digits as its factorization.

42819191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725808.

The product of its digits is 5184, while the sum is 35.

The square root of 42819191 is about 6543.6374441132. The cubic root of 42819191 is about 349.8480728369.

The spelling of 42819191 in words is "forty-two million, eight hundred nineteen thousand, one hundred ninety-one".