43121277989 has 4 divisors (see below), whose sum is σ = 43140505056. Its totient is φ = 43102050924.

The previous prime is 43121277943. The next prime is 43121278001. The reversal of 43121277989 is 98977212134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98977212134 = 2 ⋅49488606067.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43121277989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43121277989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121277889) 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, 9610169 + ... + 9614654.

It is an arithmetic number, because the mean of its divisors is an integer number (10785126264).

Almost surely, 2^43121277989 is an apocalyptic number.

It is an amenable number.

43121277989 is a deficient number, since it is larger than the sum of its proper divisors (19227067).

43121277989 is a wasteful number, since it uses less digits than its factorization.

43121277989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19227066.

The product of its digits is 1524096, while the sum is 53.

The spelling of 43121277989 in words is "forty-three billion, one hundred twenty-one million, two hundred seventy-seven thousand, nine hundred eighty-nine".