42851267891 has 4 divisors (see below), whose sum is σ = 45106597800. Its totient is φ = 40595937984.

The previous prime is 42851267887. The next prime is 42851267897. The reversal of 42851267891 is 19876215824.

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 42851267891 - 2² = 42851267887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42851267897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127664926 + ... + 1127664963.

It is an arithmetic number, because the mean of its divisors is an integer number (11276649450).

Almost surely, 2^42851267891 is an apocalyptic number.

42851267891 is a deficient number, since it is larger than the sum of its proper divisors (2255329909).

42851267891 is a wasteful number, since it uses less digits than its factorization.

42851267891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255329908.

The product of its digits is 1935360, while the sum is 53.

The spelling of 42851267891 in words is "forty-two billion, eight hundred fifty-one million, two hundred sixty-seven thousand, eight hundred ninety-one".