689524861 has 4 divisors (see below), whose sum is σ = 692272224. Its totient is φ = 686777500.

The previous prime is 689524853. The next prime is 689524867. The reversal of 689524861 is 168425986.

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 an emirpimes, since its reverse is a distinct semiprime: 168425986 = 2 ⋅84212993.

It is a cyclic number.

It is not a de Polignac number, because 689524861 - 2³ = 689524853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689524867) 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, 1373305 + ... + 1373806.

It is an arithmetic number, because the mean of its divisors is an integer number (173068056).

Almost surely, 2^689524861 is an apocalyptic number.

It is an amenable number.

689524861 is a deficient number, since it is larger than the sum of its proper divisors (2747363).

689524861 is a wasteful number, since it uses less digits than its factorization.

689524861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747362.

The product of its digits is 829440, while the sum is 49.

The square root of 689524861 is about 26258.8053993322. The cubic root of 689524861 is about 883.4527151176.

The spelling of 689524861 in words is "six hundred eighty-nine million, five hundred twenty-four thousand, eight hundred sixty-one".