28971711161 has 4 divisors (see below), whose sum is σ = 29055203472. Its totient is φ = 28888218852.

The previous prime is 28971711077. The next prime is 28971711173. The reversal of 28971711161 is 16111717982.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28971711161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28971791161) 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, 41745635 + ... + 41746328.

It is an arithmetic number, because the mean of its divisors is an integer number (7263800868).

Almost surely, 2^28971711161 is an apocalyptic number.

It is an amenable number.

28971711161 is a deficient number, since it is larger than the sum of its proper divisors (83492311).

28971711161 is an equidigital number, since it uses as much as digits as its factorization.

28971711161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83492310.

The product of its digits is 42336, while the sum is 44.

The spelling of 28971711161 in words is "twenty-eight billion, nine hundred seventy-one million, seven hundred eleven thousand, one hundred sixty-one".