5123131521 has 8 divisors (see below), whose sum is σ = 6870327360. Its totient is φ = 3395678352.

The previous prime is 5123131493. The next prime is 5123131529. The reversal of 5123131521 is 1251313215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5123131521 - 2⁶ = 5123131457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5123131491 and 5123131500.

It is not an unprimeable number, because it can be changed into a prime (5123131529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4935061 + ... + 4936098.

It is an arithmetic number, because the mean of its divisors is an integer number (858790920).

Almost surely, 2^5123131521 is an apocalyptic number.

It is an amenable number.

5123131521 is a deficient number, since it is larger than the sum of its proper divisors (1747195839).

5123131521 is a wasteful number, since it uses less digits than its factorization.

5123131521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9871335.

The product of its digits is 900, while the sum is 24.

The square root of 5123131521 is about 71576.0541033103. The cubic root of 5123131521 is about 1723.8990688207.

Adding to 5123131521 its reverse (1251313215), we get a palindrome (6374444736).

The spelling of 5123131521 in words is "five billion, one hundred twenty-three million, one hundred thirty-one thousand, five hundred twenty-one".