28189099531 has 2 divisors, whose sum is σ = 28189099532. Its totient is φ = 28189099530.

The previous prime is 28189099513. The next prime is 28189099553. The reversal of 28189099531 is 13599098182.

Together with previous prime (28189099513) 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 28189099531 - 2¹⁹ = 28188575243 is a prime.

It is a super-2 number, since 2×28189099531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28189099231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14094549765 + 14094549766.

It is an arithmetic number, because the mean of its divisors is an integer number (14094549766).

Almost surely, 2^28189099531 is an apocalyptic number.

28189099531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28189099531 is an equidigital number, since it uses as much as digits as its factorization.

28189099531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 55.

The spelling of 28189099531 in words is "twenty-eight billion, one hundred eighty-nine million, ninety-nine thousand, five hundred thirty-one".