988711091 has 4 divisors (see below), whose sum is σ = 990254184. Its totient is φ = 987168000.

The previous prime is 988711081. The next prime is 988711099. The reversal of 988711091 is 190117889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190117889 = 13 ⋅14624453.

It is a cyclic number.

It is not a de Polignac number, because 988711091 - 2¹⁸ = 988448947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988711099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770585 + ... + 771866.

It is an arithmetic number, because the mean of its divisors is an integer number (247563546).

Almost surely, 2^988711091 is an apocalyptic number.

988711091 is a deficient number, since it is larger than the sum of its proper divisors (1543093).

988711091 is a wasteful number, since it uses less digits than its factorization.

988711091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543092.

The product of its (nonzero) digits is 36288, while the sum is 44.

The square root of 988711091 is about 31443.7766656615. The cubic root of 988711091 is about 996.2227809130. Note that the first 3 decimals are identical.

The spelling of 988711091 in words is "nine hundred eighty-eight million, seven hundred eleven thousand, ninety-one".