42939781591 has 8 divisors (see below), whose sum is σ = 49247444864. Its totient is φ = 36675470520.

The previous prime is 42939781589. The next prime is 42939781607. The reversal of 42939781591 is 19518793924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42939781591 - 2¹ = 42939781589 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 (42939781561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10835925 + ... + 10839886.

It is an arithmetic number, because the mean of its divisors is an integer number (6155930608).

Almost surely, 2^42939781591 is an apocalyptic number.

42939781591 is a deficient number, since it is larger than the sum of its proper divisors (6307663273).

42939781591 is a wasteful number, since it uses less digits than its factorization.

42939781591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21676101.

The product of its digits is 4898880, while the sum is 58.

The spelling of 42939781591 in words is "forty-two billion, nine hundred thirty-nine million, seven hundred eighty-one thousand, five hundred ninety-one".