28601806091 has 2 divisors, whose sum is σ = 28601806092. Its totient is φ = 28601806090.

The previous prime is 28601806081. The next prime is 28601806109. The reversal of 28601806091 is 19060810682.

Together with next prime (28601806109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28601806091 - 2⁶ = 28601806027 is a prime.

It is not a weakly prime, because it can be changed into another prime (28601806061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14300903045 + 14300903046.

It is an arithmetic number, because the mean of its divisors is an integer number (14300903046).

Almost surely, 2^28601806091 is an apocalyptic number.

28601806091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28601806091 is an equidigital number, since it uses as much as digits as its factorization.

28601806091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 28601806091 in words is "twenty-eight billion, six hundred one million, eight hundred six thousand, ninety-one".