12971523 has 4 divisors (see below), whose sum is σ = 17295368. Its totient is φ = 8647680.

The previous prime is 12971521. The next prime is 12971533. The reversal of 12971523 is 32517921.

12971523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12971523 - 2¹ = 12971521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12971521) 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, 2161918 + ... + 2161923.

It is an arithmetic number, because the mean of its divisors is an integer number (4323842).

Almost surely, 2^12971523 is an apocalyptic number.

12971523 is a deficient number, since it is larger than the sum of its proper divisors (4323845).

12971523 is an equidigital number, since it uses as much as digits as its factorization.

12971523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323844.

The product of its digits is 3780, while the sum is 30.

The square root of 12971523 is about 3601.6000610840. The cubic root of 12971523 is about 234.9616536194.

The spelling of 12971523 in words is "twelve million, nine hundred seventy-one thousand, five hundred twenty-three".