12971817 has 6 divisors (see below), whose sum is σ = 18737082. Its totient is φ = 8647872.

The previous prime is 12971797. The next prime is 12971831. The reversal of 12971817 is 71817921.

It can be written as a sum of positive squares in only one way, i.e., 12787776 + 184041 = 3576^2 + 429^2 .

It is not a de Polignac number, because 12971817 - 2¹⁸ = 12709673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12971837) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 720648 + ... + 720665.

It is an arithmetic number, because the mean of its divisors is an integer number (3122847).

Almost surely, 2^12971817 is an apocalyptic number.

It is an amenable number.

12971817 is a deficient number, since it is larger than the sum of its proper divisors (5765265).

12971817 is a wasteful number, since it uses less digits than its factorization.

12971817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441319 (or 1441316 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 12971817 is about 3601.6408760453. The cubic root of 12971817 is about 234.9634287439.

The spelling of 12971817 in words is "twelve million, nine hundred seventy-one thousand, eight hundred seventeen".