43121794639 has 16 divisors (see below), whose sum is σ = 53871780096. Its totient is φ = 33532934400.

The previous prime is 43121794609. The next prime is 43121794657. The reversal of 43121794639 is 93649712134.

It is not a de Polignac number, because 43121794639 - 2⁵ = 43121794607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43121794592 and 43121794601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121794609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532482 + ... + 608095.

It is an arithmetic number, because the mean of its divisors is an integer number (3366986256).

Almost surely, 2^43121794639 is an apocalyptic number.

43121794639 is a deficient number, since it is larger than the sum of its proper divisors (10749985457).

43121794639 is a wasteful number, since it uses less digits than its factorization.

43121794639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141086.

The product of its digits is 979776, while the sum is 49.

The spelling of 43121794639 in words is "forty-three billion, one hundred twenty-one million, seven hundred ninety-four thousand, six hundred thirty-nine".