43091891923 has 4 divisors (see below), whose sum is σ = 43093645848. Its totient is φ = 43090138000.

The previous prime is 43091891881. The next prime is 43091891959. The reversal of 43091891923 is 32919819034.

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 43091891923 - 2²¹ = 43089794771 is a prime.

It is a super-2 number, since 2×43091891923² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43091892923) 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, 839578 + ... + 889423.

It is an arithmetic number, because the mean of its divisors is an integer number (10773411462).

Almost surely, 2^43091891923 is an apocalyptic number.

43091891923 is a deficient number, since it is larger than the sum of its proper divisors (1753925).

43091891923 is a wasteful number, since it uses less digits than its factorization.

43091891923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753924.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 43091891923 in words is "forty-three billion, ninety-one million, eight hundred ninety-one thousand, nine hundred twenty-three".