868521869 has 4 divisors (see below), whose sum is σ = 888720096. Its totient is φ = 848323644.

The previous prime is 868521859. The next prime is 868521881. The reversal of 868521869 is 968125868.

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.

It is a cyclic number.

It is not a de Polignac number, because 868521869 - 2⁸ = 868521613 is a prime.

It is a super-2 number, since 2×868521869² = 1508660473862506322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 868521869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868521839) 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, 10099049 + ... + 10099134.

It is an arithmetic number, because the mean of its divisors is an integer number (222180024).

Almost surely, 2^868521869 is an apocalyptic number.

It is an amenable number.

868521869 is a deficient number, since it is larger than the sum of its proper divisors (20198227).

868521869 is a wasteful number, since it uses less digits than its factorization.

868521869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20198226.

The product of its digits is 1658880, while the sum is 53.

The square root of 868521869 is about 29470.6950885112. The cubic root of 868521869 is about 954.0993194887.

The spelling of 868521869 in words is "eight hundred sixty-eight million, five hundred twenty-one thousand, eight hundred sixty-nine".