989488691 has 2 divisors, whose sum is σ = 989488692. Its totient is φ = 989488690.

The previous prime is 989488673. The next prime is 989488693. The reversal of 989488691 is 196884989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989488691 - 2⁶ = 989488627 is a prime.

Together with 989488693, 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 (989488693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494744345 + 494744346.

It is an arithmetic number, because the mean of its divisors is an integer number (494744346).

Almost surely, 2^989488691 is an apocalyptic number.

989488691 is a deficient number, since it is larger than the sum of its proper divisors (1).

989488691 is an equidigital number, since it uses as much as digits as its factorization.

989488691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 62.

The square root of 989488691 is about 31456.1391623320. The cubic root of 989488691 is about 996.4838817357.

The spelling of 989488691 in words is "nine hundred eighty-nine million, four hundred eighty-eight thousand, six hundred ninety-one".