12971993 has 2 divisors, whose sum is σ = 12971994. Its totient is φ = 12971992.

The previous prime is 12971971. The next prime is 12971999. The reversal of 12971993 is 39917921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11744329 + 1227664 = 3427^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 12971993 - 2⁶ = 12971929 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12971993.

It is not a weakly prime, because it can be changed into another prime (12971999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6485996 + 6485997.

It is an arithmetic number, because the mean of its divisors is an integer number (6485997).

Almost surely, 2^12971993 is an apocalyptic number.

It is an amenable number.

12971993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12971993 is an equidigital number, since it uses as much as digits as its factorization.

12971993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 41.

The square root of 12971993 is about 3601.6653092701. The cubic root of 12971993 is about 234.9644913906.

The spelling of 12971993 in words is "twelve million, nine hundred seventy-one thousand, nine hundred ninety-three".