523240131 has 4 divisors (see below), whose sum is σ = 697653512. Its totient is φ = 348826752.

The previous prime is 523240117. The next prime is 523240139. The reversal of 523240131 is 131042325.

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

It is not a de Polignac number, because 523240131 - 2¹¹ = 523238083 is a prime.

It is a super-2 number, since 2×523240131² = 547560469377794322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 523240098 and 523240107.

It is not an unprimeable number, because it can be changed into a prime (523240139) 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, 87206686 + ... + 87206691.

It is an arithmetic number, because the mean of its divisors is an integer number (174413378).

Almost surely, 2^523240131 is an apocalyptic number.

523240131 is a deficient number, since it is larger than the sum of its proper divisors (174413381).

523240131 is a wasteful number, since it uses less digits than its factorization.

523240131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174413380.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 523240131 is about 22874.4427473108. The cubic root of 523240131 is about 805.8119097786.

Adding to 523240131 its reverse (131042325), we get a palindrome (654282456).

The spelling of 523240131 in words is "five hundred twenty-three million, two hundred forty thousand, one hundred thirty-one".