89665399 has 2 divisors, whose sum is σ = 89665400. Its totient is φ = 89665398.

The previous prime is 89665337. The next prime is 89665441. The reversal of 89665399 is 99356698.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89665399 - 2²³ = 81276791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89665699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44832699 + 44832700.

It is an arithmetic number, because the mean of its divisors is an integer number (44832700).

Almost surely, 2^89665399 is an apocalyptic number.

89665399 is a deficient number, since it is larger than the sum of its proper divisors (1).

89665399 is an equidigital number, since it uses as much as digits as its factorization.

89665399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 55.

The square root of 89665399 is about 9469.1815380211. The cubic root of 89665399 is about 447.5844210963.

It can be divided in two parts, 8966 and 5399, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 89665399 in words is "eighty-nine million, six hundred sixty-five thousand, three hundred ninety-nine".