689143581 has 24 divisors (see below), whose sum is σ = 1149372224. Its totient is φ = 389733120.

The previous prime is 689143561. The next prime is 689143589. The reversal of 689143581 is 185341986.

689143581 is a `hidden beast` number, since 68 + 9 + 1 + 4 + 3 + 581 = 666.

It is not a de Polignac number, because 689143581 - 2¹⁵ = 689110813 is a prime.

It is a super-2 number, since 2×689143581² = 949837750467007122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689143589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50275 + ... + 62496.

Almost surely, 2^689143581 is an apocalyptic number.

It is an amenable number.

689143581 is a deficient number, since it is larger than the sum of its proper divisors (460228643).

689143581 is a wasteful number, since it uses less digits than its factorization.

689143581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112881 (or 112878 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 689143581 is about 26251.5443545708. The cubic root of 689143581 is about 883.2898469475.

The spelling of 689143581 in words is "six hundred eighty-nine million, one hundred forty-three thousand, five hundred eighty-one".