42911819 has 4 divisors (see below), whose sum is σ = 43168944. Its totient is φ = 42654696.

The previous prime is 42911797. The next prime is 42911831. The reversal of 42911819 is 91811924.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42911819 is a prime.

It is a super-2 number, since 2×42911819² = 3682848419777522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42911879) 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, 128312 + ... + 128645.

It is an arithmetic number, because the mean of its divisors is an integer number (10792236).

Almost surely, 2^42911819 is an apocalyptic number.

42911819 is a deficient number, since it is larger than the sum of its proper divisors (257125).

42911819 is a wasteful number, since it uses less digits than its factorization.

42911819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257124.

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

The square root of 42911819 is about 6550.7113354200. The cubic root of 42911819 is about 350.1001590900.

The spelling of 42911819 in words is "forty-two million, nine hundred eleven thousand, eight hundred nineteen".