28959099121 has 4 divisors (see below), whose sum is σ = 28967095872. Its totient is φ = 28951102372.

The previous prime is 28959099073. The next prime is 28959099133. The reversal of 28959099121 is 12199095982.

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: 12199095982 = 2 ⋅6099547991.

It is a cyclic number.

It is not a de Polignac number, because 28959099121 - 2¹¹ = 28959097073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28959049121) 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, 3992941 + ... + 4000186.

It is an arithmetic number, because the mean of its divisors is an integer number (7241773968).

Almost surely, 2^28959099121 is an apocalyptic number.

It is an amenable number.

28959099121 is a deficient number, since it is larger than the sum of its proper divisors (7996751).

28959099121 is an equidigital number, since it uses as much as digits as its factorization.

28959099121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996750.

The product of its (nonzero) digits is 1049760, while the sum is 55.

The spelling of 28959099121 in words is "twenty-eight billion, nine hundred fifty-nine million, ninety-nine thousand, one hundred twenty-one".