5123131523 has 4 divisors (see below), whose sum is σ = 5172870768. Its totient is φ = 5073392280.

The previous prime is 5123131493. The next prime is 5123131529. The reversal of 5123131523 is 3251313215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3251313215 = 5 ⋅650262643.

It is a cyclic number.

It is not a de Polignac number, because 5123131523 - 2⁸ = 5123131267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5123131492 and 5123131501.

It is not an unprimeable number, because it can be changed into a prime (5123131529) 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, 24869468 + ... + 24869673.

It is an arithmetic number, because the mean of its divisors is an integer number (1293217692).

Almost surely, 2^5123131523 is an apocalyptic number.

5123131523 is a deficient number, since it is larger than the sum of its proper divisors (49739245).

5123131523 is a wasteful number, since it uses less digits than its factorization.

5123131523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49739244.

The product of its digits is 2700, while the sum is 26.

The square root of 5123131523 is about 71576.0541172814. The cubic root of 5123131523 is about 1723.8990690450.

Adding to 5123131523 its reverse (3251313215), we get a palindrome (8374444738).

The spelling of 5123131523 in words is "five billion, one hundred twenty-three million, one hundred thirty-one thousand, five hundred twenty-three".