91024889 has 2 divisors, whose sum is σ = 91024890. Its totient is φ = 91024888.

The previous prime is 91024883. The next prime is 91024891. The reversal of 91024889 is 98842019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 18774889 = 8500^2 + 4333^2 .

It is a cyclic number.

It is not a de Polignac number, because 91024889 - 2¹⁶ = 90959353 is a prime.

Together with 91024891, 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 (91024883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45512444 + 45512445.

It is an arithmetic number, because the mean of its divisors is an integer number (45512445).

Almost surely, 2^91024889 is an apocalyptic number.

It is an amenable number.

91024889 is a deficient number, since it is larger than the sum of its proper divisors (1).

91024889 is an equidigital number, since it uses as much as digits as its factorization.

91024889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 91024889 is about 9540.6964630471. The cubic root of 91024889 is about 449.8351478462.

The spelling of 91024889 in words is "ninety-one million, twenty-four thousand, eight hundred eighty-nine".