8691489 has 16 divisors (see below), whose sum is σ = 12922240. Its totient is φ = 5773680.

The previous prime is 8691481. The next prime is 8691497. The reversal of 8691489 is 9841968.

8691489 is a `hidden beast` number, since 86 + 91 + 489 = 666.

It is an interprime number because it is at equal distance from previous prime (8691481) and next prime (8691497).

It is not a de Polignac number, because 8691489 - 2³ = 8691481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8691481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12819 + ... + 13479.

It is an arithmetic number, because the mean of its divisors is an integer number (807640).

Almost surely, 2^8691489 is an apocalyptic number.

It is an amenable number.

8691489 is a deficient number, since it is larger than the sum of its proper divisors (4230751).

8691489 is a wasteful number, since it uses less digits than its factorization.

8691489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157 (or 1151 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 8691489 is about 2948.1331381062. The cubic root of 8691489 is about 205.6039220764.

It can be divided in two parts, 8691 and 489, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 8691489 in words is "eight million, six hundred ninety-one thousand, four hundred eighty-nine".