89128939 has 2 divisors, whose sum is σ = 89128940. Its totient is φ = 89128938.

The previous prime is 89128931. The next prime is 89128997. The reversal of 89128939 is 93982198.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89128939 - 2³ = 89128931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 89128892 and 89128901.

It is not a weakly prime, because it can be changed into another prime (89128931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44564469 + 44564470.

It is an arithmetic number, because the mean of its divisors is an integer number (44564470).

Almost surely, 2^89128939 is an apocalyptic number.

89128939 is a deficient number, since it is larger than the sum of its proper divisors (1).

89128939 is an equidigital number, since it uses as much as digits as its factorization.

89128939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 89128939 is about 9440.8124120756. The cubic root of 89128939 is about 446.6900159201.

The spelling of 89128939 in words is "eighty-nine million, one hundred twenty-eight thousand, nine hundred thirty-nine".