89128913 has 2 divisors, whose sum is σ = 89128914. Its totient is φ = 89128912.

The previous prime is 89128903. The next prime is 89128931. The reversal of 89128913 is 31982198.

Together with next prime (89128931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88585744 + 543169 = 9412^2 + 737^2 .

It is a cyclic number.

It is not a de Polignac number, because 89128913 - 2¹² = 89124817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89128903) 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, 44564456 + 44564457.

It is an arithmetic number, because the mean of its divisors is an integer number (44564457).

Almost surely, 2^89128913 is an apocalyptic number.

It is an amenable number.

89128913 is a deficient number, since it is larger than the sum of its proper divisors (1).

89128913 is an equidigital number, since it uses as much as digits as its factorization.

89128913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 89128913 is about 9440.8110350753. The cubic root of 89128913 is about 446.6899724851.

The spelling of 89128913 in words is "eighty-nine million, one hundred twenty-eight thousand, nine hundred thirteen".