89609999 has 2 divisors, whose sum is σ = 89610000. Its totient is φ = 89609998.

The previous prime is 89609963. The next prime is 89610049. The reversal of 89609999 is 99990698.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89609999 - 2⁸ = 89609743 is a prime.

89609999 is a modest number, since divided by 9999 gives 8960 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89609929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44804999 + 44805000.

It is an arithmetic number, because the mean of its divisors is an integer number (44805000).

Almost surely, 2^89609999 is an apocalyptic number.

89609999 is a deficient number, since it is larger than the sum of its proper divisors (1).

89609999 is an equidigital number, since it uses as much as digits as its factorization.

89609999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 59.

The square root of 89609999 is about 9466.2558068119. The cubic root of 89609999 is about 447.4922217056.

The spelling of 89609999 in words is "eighty-nine million, six hundred nine thousand, nine hundred ninety-nine".