876988991 has 2 divisors, whose sum is σ = 876988992. Its totient is φ = 876988990.

The previous prime is 876988967. The next prime is 876988993. The reversal of 876988991 is 199889678.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-876988991 is a prime.

Together with 876988993, 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 (876988993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438494495 + 438494496.

It is an arithmetic number, because the mean of its divisors is an integer number (438494496).

Almost surely, 2^876988991 is an apocalyptic number.

876988991 is a deficient number, since it is larger than the sum of its proper divisors (1).

876988991 is an equidigital number, since it uses as much as digits as its factorization.

876988991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 65.

The square root of 876988991 is about 29613.9999155805. Note that the first 4 decimals coincide. The cubic root of 876988991 is about 957.1897673102.

The spelling of 876988991 in words is "eight hundred seventy-six million, nine hundred eighty-eight thousand, nine hundred ninety-one".