869484521 has 4 divisors (see below), whose sum is σ = 879254100. Its totient is φ = 859714944.

The previous prime is 869484503. The next prime is 869484523. The reversal of 869484521 is 125484968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140754496 + 728730025 = 11864^2 + 26995^2 .

It is a cyclic number.

It is not a de Polignac number, because 869484521 - 2¹⁴ = 869468137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869484523) 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, 4884656 + ... + 4884833.

It is an arithmetic number, because the mean of its divisors is an integer number (219813525).

Almost surely, 2^869484521 is an apocalyptic number.

It is an amenable number.

869484521 is a deficient number, since it is larger than the sum of its proper divisors (9769579).

869484521 is an equidigital number, since it uses as much as digits as its factorization.

869484521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9769578.

The product of its digits is 552960, while the sum is 47.

The square root of 869484521 is about 29487.0229253480. The cubic root of 869484521 is about 954.4516907697.

The spelling of 869484521 in words is "eight hundred sixty-nine million, four hundred eighty-four thousand, five hundred twenty-one".