523681969 has 4 divisors (see below), whose sum is σ = 524102500. Its totient is φ = 523261440.

The previous prime is 523681967. The next prime is 523681981. The reversal of 523681969 is 969186325.

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 262051344 + 261630625 = 16188^2 + 16175^2 .

It is a cyclic number.

It is not a de Polignac number, because 523681969 - 2¹ = 523681967 is a prime.

It is a super-2 number, since 2×523681969² = 548485609311433922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (523681967) 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, 208392 + ... + 210889.

It is an arithmetic number, because the mean of its divisors is an integer number (131025625).

Almost surely, 2^523681969 is an apocalyptic number.

It is an amenable number.

523681969 is a deficient number, since it is larger than the sum of its proper divisors (420531).

523681969 is a wasteful number, since it uses less digits than its factorization.

523681969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420530.

The product of its digits is 699840, while the sum is 49.

The square root of 523681969 is about 22884.0986058005. The cubic root of 523681969 is about 806.0386623615.

The spelling of 523681969 in words is "five hundred twenty-three million, six hundred eighty-one thousand, nine hundred sixty-nine".