989357121 has 12 divisors (see below), whose sum is σ = 1491205248. Its totient is φ = 630894264.

The previous prime is 989357119. The next prime is 989357123. The reversal of 989357121 is 121753989.

It is an interprime number because it is at equal distance from previous prime (989357119) and next prime (989357123).

It is not a de Polignac number, because 989357121 - 2¹ = 989357119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989357123) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2389545 + ... + 2389958.

It is an arithmetic number, because the mean of its divisors is an integer number (124267104).

Almost surely, 2^989357121 is an apocalyptic number.

It is an amenable number.

989357121 is a deficient number, since it is larger than the sum of its proper divisors (501848127).

989357121 is a wasteful number, since it uses less digits than its factorization.

989357121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4779532 (or 4779529 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 989357121 is about 31454.0477681331. The cubic root of 989357121 is about 996.4397130666.

The spelling of 989357121 in words is "nine hundred eighty-nine million, three hundred fifty-seven thousand, one hundred twenty-one".