28941963121 has 4 divisors (see below), whose sum is σ = 28960294000. Its totient is φ = 28923632244.

The previous prime is 28941963109. The next prime is 28941963131. The reversal of 28941963121 is 12136914982.

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 not a de Polignac number, because 28941963121 - 2¹¹ = 28941961073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28941963131) 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, 9163071 + ... + 9166228.

It is an arithmetic number, because the mean of its divisors is an integer number (7240073500).

Almost surely, 2^28941963121 is an apocalyptic number.

It is an amenable number.

28941963121 is a deficient number, since it is larger than the sum of its proper divisors (18330879).

28941963121 is a wasteful number, since it uses less digits than its factorization.

28941963121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18330878.

The product of its digits is 186624, while the sum is 46.

The spelling of 28941963121 in words is "twenty-eight billion, nine hundred forty-one million, nine hundred sixty-three thousand, one hundred twenty-one".