521109969 has 16 divisors (see below), whose sum is σ = 717926400. Its totient is φ = 335872080.

The previous prime is 521109949. The next prime is 521109997. The reversal of 521109969 is 969901125.

It is a happy number.

It is not a de Polignac number, because 521109969 - 2⁵ = 521109937 is a prime.

It is a super-2 number, since 2×521109969² = 543111199582361922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521109969.

It is not an unprimeable number, because it can be changed into a prime (521109929) 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, 125082 + ... + 129180.

It is an arithmetic number, because the mean of its divisors is an integer number (44870400).

Almost surely, 2^521109969 is an apocalyptic number.

It is an amenable number.

521109969 is a deficient number, since it is larger than the sum of its proper divisors (196816431).

521109969 is a wasteful number, since it uses less digits than its factorization.

521109969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 521109969 is about 22827.8332086074. The cubic root of 521109969 is about 804.7169093187.

The spelling of 521109969 in words is "five hundred twenty-one million, one hundred nine thousand, nine hundred sixty-nine".