28531214431 has 2 divisors, whose sum is σ = 28531214432. Its totient is φ = 28531214430.

The previous prime is 28531214429. The next prime is 28531214477. The reversal of 28531214431 is 13441213582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28531214431 - 2¹ = 28531214429 is a prime.

It is a super-2 number, since 2×28531214431² (a number of 22 digits) contains 22 as substring.

Together with 28531214429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28531218431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265607215 + 14265607216.

It is an arithmetic number, because the mean of its divisors is an integer number (14265607216).

Almost surely, 2^28531214431 is an apocalyptic number.

28531214431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531214431 is an equidigital number, since it uses as much as digits as its factorization.

28531214431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The spelling of 28531214431 in words is "twenty-eight billion, five hundred thirty-one million, two hundred fourteen thousand, four hundred thirty-one".