31523405123 has 4 divisors (see below), whose sum is σ = 36026748720. Its totient is φ = 27020061528.

The previous prime is 31523405047. The next prime is 31523405149. The reversal of 31523405123 is 32150432513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32150432513 = 19 ⋅1692128027.

It is a cyclic number.

It is not a de Polignac number, because 31523405123 - 2⁸ = 31523404867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31523405423) 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, 2251671788 + ... + 2251671801.

It is an arithmetic number, because the mean of its divisors is an integer number (9006687180).

Almost surely, 2^31523405123 is an apocalyptic number.

31523405123 is a deficient number, since it is larger than the sum of its proper divisors (4503343597).

31523405123 is an equidigital number, since it uses as much as digits as its factorization.

31523405123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4503343596.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 31523405123 its reverse (32150432513), we get a palindrome (63673837636).

The spelling of 31523405123 in words is "thirty-one billion, five hundred twenty-three million, four hundred five thousand, one hundred twenty-three".