42891913 has 4 divisors (see below), whose sum is σ = 43292880. Its totient is φ = 42490948.

The previous prime is 42891907. The next prime is 42891923. The reversal of 42891913 is 31919824.

42891913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42891913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42891923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200323 + ... + 200536.

It is an arithmetic number, because the mean of its divisors is an integer number (10823220).

Almost surely, 2^42891913 is an apocalyptic number.

It is an amenable number.

42891913 is a deficient number, since it is larger than the sum of its proper divisors (400967).

42891913 is a wasteful number, since it uses less digits than its factorization.

42891913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400966.

The product of its digits is 15552, while the sum is 37.

The square root of 42891913 is about 6549.1917821973. The cubic root of 42891913 is about 350.0460157186.

The spelling of 42891913 in words is "forty-two million, eight hundred ninety-one thousand, nine hundred thirteen".