523681831 has 4 divisors (see below), whose sum is σ = 537835432. Its totient is φ = 509528232.

The previous prime is 523681813. The next prime is 523681867. The reversal of 523681831 is 138186325.

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

It is a cyclic number.

It is not a de Polignac number, because 523681831 - 2⁵ = 523681799 is a prime.

It is a super-2 number, since 2×523681831² = 548485320239025122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 14153563 = 523681831 / (5 + 2 + 3 + 6 + 8 + 1 + 8 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523681811) 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, 7076745 + ... + 7076818.

It is an arithmetic number, because the mean of its divisors is an integer number (134458858).

Almost surely, 2^523681831 is an apocalyptic number.

523681831 is a deficient number, since it is larger than the sum of its proper divisors (14153601).

523681831 is a wasteful number, since it uses less digits than its factorization.

523681831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14153600.

The product of its digits is 34560, while the sum is 37.

The square root of 523681831 is about 22884.0955906062. The cubic root of 523681831 is about 806.0385915594.

The spelling of 523681831 in words is "five hundred twenty-three million, six hundred eighty-one thousand, eight hundred thirty-one".