988888888891 has 2 divisors, whose sum is σ = 988888888892. Its totient is φ = 988888888890.

The previous prime is 988888888873. The next prime is 988888888907. The reversal of 988888888891 is 198888888889.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 988888888891 - 2¹⁹ = 988888364603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 988888888796 and 988888888805.

It is not a weakly prime, because it can be changed into another prime (988888880891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494444444445 + 494444444446.

It is an arithmetic number, because the mean of its divisors is an integer number (494444444446).

Almost surely, 2^988888888891 is an apocalyptic number.

988888888891 is a deficient number, since it is larger than the sum of its proper divisors (1).

988888888891 is an equidigital number, since it uses as much as digits as its factorization.

988888888891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10871635968, while the sum is 91.

The spelling of 988888888891 in words is "nine hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-one".