28081833121 has 2 divisors, whose sum is σ = 28081833122. Its totient is φ = 28081833120.

The previous prime is 28081833113. The next prime is 28081833133. The reversal of 28081833121 is 12133818082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25319174400 + 2762658721 = 159120^2 + 52561^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081833121 - 2³ = 28081833113 is a prime.

It is not a weakly prime, because it can be changed into another prime (28081833151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040916560 + 14040916561.

It is an arithmetic number, because the mean of its divisors is an integer number (14040916561).

Almost surely, 2^28081833121 is an apocalyptic number.

It is an amenable number.

28081833121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081833121 is an equidigital number, since it uses as much as digits as its factorization.

28081833121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 37.

The spelling of 28081833121 in words is "twenty-eight billion, eighty-one million, eight hundred thirty-three thousand, one hundred twenty-one".