42912191 has 6 divisors (see below), whose sum is σ = 49918320. Its totient is φ = 36781836.

The previous prime is 42912179. The next prime is 42912223. The reversal of 42912191 is 19121924.

It is not a de Polignac number, because 42912191 - 2¹⁴ = 42895807 is a prime.

It is a super-2 number, since 2×42912191² = 3682912272840962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42912391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 437831 + ... + 437928.

It is an arithmetic number, because the mean of its divisors is an integer number (8319720).

Almost surely, 2^42912191 is an apocalyptic number.

42912191 is a deficient number, since it is larger than the sum of its proper divisors (7006129).

42912191 is an equidigital number, since it uses as much as digits as its factorization.

42912191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875773 (or 875766 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 42912191 is about 6550.7397292214. The cubic root of 42912191 is about 350.1011707528.

The spelling of 42912191 in words is "forty-two million, nine hundred twelve thousand, one hundred ninety-one".