984088991 has 2 divisors, whose sum is σ = 984088992. Its totient is φ = 984088990.

The previous prime is 984088981. The next prime is 984088993. The reversal of 984088991 is 199880489.

It is a strong prime.

It is an emirp because it is prime and its reverse (199880489) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-984088991 is a prime.

It is a super-2 number, since 2×984088991² = 1936862284414796162, which contains 22 as substring.

Together with 984088993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (984088993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492044495 + 492044496.

It is an arithmetic number, because the mean of its divisors is an integer number (492044496).

Almost surely, 2^984088991 is an apocalyptic number.

984088991 is a deficient number, since it is larger than the sum of its proper divisors (1).

984088991 is an equidigital number, since it uses as much as digits as its factorization.

984088991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 56.

The square root of 984088991 is about 31370.1927153787. The cubic root of 984088991 is about 994.6679501087.

The spelling of 984088991 in words is "nine hundred eighty-four million, eighty-eight thousand, nine hundred ninety-one".