42691071 has 4 divisors (see below), whose sum is σ = 56921432. Its totient is φ = 28460712.

The previous prime is 42691069. The next prime is 42691079. The reversal of 42691071 is 17019624.

It is a happy number.

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

It is not a de Polignac number, because 42691071 - 2¹ = 42691069 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 (42691079) 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 in 3 ways as a sum of consecutive naturals, for example, 7115176 + ... + 7115181.

It is an arithmetic number, because the mean of its divisors is an integer number (14230358).

Almost surely, 2^42691071 is an apocalyptic number.

42691071 is a deficient number, since it is larger than the sum of its proper divisors (14230361).

42691071 is a wasteful number, since it uses less digits than its factorization.

42691071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14230360.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 42691071 is about 6533.8404480061. The cubic root of 42691071 is about 349.4987955366.

The spelling of 42691071 in words is "forty-two million, six hundred ninety-one thousand, seventy-one".