989155 has 4 divisors (see below), whose sum is σ = 1186992. Its totient is φ = 791320.

The previous prime is 989123. The next prime is 989171. The reversal of 989155 is 551989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551989 = 61 ⋅9049.

It is not a de Polignac number, because 989155 - 2⁵ = 989123 is a prime.

It is a super-2 number, since 2×989155² = 1956855228050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98911 + ... + 98920.

It is an arithmetic number, because the mean of its divisors is an integer number (296748).

2⁹⁸⁹¹⁵⁵ is an apocalyptic number.

989155 is a deficient number, since it is larger than the sum of its proper divisors (197837).

989155 is a wasteful number, since it uses less digits than its factorization.

989155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197836.

The product of its digits is 16200, while the sum is 37.

The square root of 989155 is about 994.5627179821. The cubic root of 989155 is about 99.6371852465.

The spelling of 989155 in words is "nine hundred eighty-nine thousand, one hundred fifty-five".