42091881973 has 4 divisors (see below), whose sum is σ = 42092472940. Its totient is φ = 42091291008.

The previous prime is 42091881961. The next prime is 42091881977. The reversal of 42091881973 is 37918819024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 145974724 + 41945907249 = 12082^2 + 204807^2 .

It is a cyclic number.

It is not a de Polignac number, because 42091881973 - 2⁵ = 42091881941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42091881973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42091881977) 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, 171228 + ... + 336901.

It is an arithmetic number, because the mean of its divisors is an integer number (10523118235).

Almost surely, 2^42091881973 is an apocalyptic number.

It is an amenable number.

42091881973 is a deficient number, since it is larger than the sum of its proper divisors (590967).

42091881973 is an equidigital number, since it uses as much as digits as its factorization.

42091881973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590966.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 42091881973 in words is "forty-two billion, ninety-one million, eight hundred eighty-one thousand, nine hundred seventy-three".