989115881 has 4 divisors (see below), whose sum is σ = 1065201732. Its totient is φ = 913030032.

The previous prime is 989115877. The next prime is 989115899. The reversal of 989115881 is 188511989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 379470400 + 609645481 = 19480^2 + 24691^2 .

It is a cyclic number.

It is not a de Polignac number, because 989115881 - 2² = 989115877 is a prime.

It is a super-2 number, since 2×989115881² = 1956700452092812322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989115821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38042906 + ... + 38042931.

It is an arithmetic number, because the mean of its divisors is an integer number (266300433).

Almost surely, 2^989115881 is an apocalyptic number.

It is an amenable number.

989115881 is a deficient number, since it is larger than the sum of its proper divisors (76085851).

989115881 is a wasteful number, since it uses less digits than its factorization.

989115881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76085850.

The product of its digits is 207360, while the sum is 50.

The square root of 989115881 is about 31450.2127337797. The cubic root of 989115881 is about 996.3587174882.

The spelling of 989115881 in words is "nine hundred eighty-nine million, one hundred fifteen thousand, eight hundred eighty-one".