989874569 has 4 divisors (see below), whose sum is σ = 989940096. Its totient is φ = 989809044.

The previous prime is 989874563. The next prime is 989874581. The reversal of 989874569 is 965478989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 965478989 = 397 ⋅2431937.

It is a cyclic number.

It is not a de Polignac number, because 989874569 - 2¹² = 989870473 is a prime.

It is a super-2 number, since 2×989874569² = 1959703324705871522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989874563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2672 + ... + 44574.

It is an arithmetic number, because the mean of its divisors is an integer number (247485024).

Almost surely, 2^989874569 is an apocalyptic number.

It is an amenable number.

989874569 is a deficient number, since it is larger than the sum of its proper divisors (65527).

989874569 is a wasteful number, since it uses less digits than its factorization.

989874569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65526.

The product of its digits is 39191040, while the sum is 65.

The square root of 989874569 is about 31462.2721525321. The cubic root of 989874569 is about 996.6134002223.

The spelling of 989874569 in words is "nine hundred eighty-nine million, eight hundred seventy-four thousand, five hundred sixty-nine".