91583489 has 2 divisors, whose sum is σ = 91583490. Its totient is φ = 91583488.

The previous prime is 91583483. The next prime is 91583491. The reversal of 91583489 is 98438519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66912400 + 24671089 = 8180^2 + 4967^2 .

It is a cyclic number.

It is not a de Polignac number, because 91583489 - 2¹² = 91579393 is a prime.

Together with 91583491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91583483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45791744 + 45791745.

It is an arithmetic number, because the mean of its divisors is an integer number (45791745).

Almost surely, 2^91583489 is an apocalyptic number.

It is an amenable number.

91583489 is a deficient number, since it is larger than the sum of its proper divisors (1).

91583489 is an equidigital number, since it uses as much as digits as its factorization.

91583489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 91583489 is about 9569.9262797579. The cubic root of 91583489 is about 450.7534521655.

The spelling of 91583489 in words is "ninety-one million, five hundred eighty-three thousand, four hundred eighty-nine".