989416916921 has 4 divisors (see below), whose sum is σ = 1047617912052. Its totient is φ = 931215921792.

The previous prime is 989416916893. The next prime is 989416916933. The reversal of 989416916921 is 129619614989.

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 832585076521 + 156831840400 = 912461^2 + 396020^2 .

It is a cyclic number.

It is not a de Polignac number, because 989416916921 - 2¹⁸ = 989416654777 is a prime.

It is a super-2 number, since 2×989416916921² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989416916221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29100497540 + ... + 29100497573.

It is an arithmetic number, because the mean of its divisors is an integer number (261904478013).

Almost surely, 2^989416916921 is an apocalyptic number.

It is an amenable number.

989416916921 is a deficient number, since it is larger than the sum of its proper divisors (58200995131).

989416916921 is a wasteful number, since it uses less digits than its factorization.

989416916921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58200995130.

The product of its digits is 15116544, while the sum is 65.

The spelling of 989416916921 in words is "nine hundred eighty-nine billion, four hundred sixteen million, nine hundred sixteen thousand, nine hundred twenty-one".