12197971 has 2 divisors, whose sum is σ = 12197972. Its totient is φ = 12197970.

The previous prime is 12197963. The next prime is 12197989. The reversal of 12197971 is 17979121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12197971 - 2³ = 12197963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12197971.

It is not a weakly prime, because it can be changed into another prime (12197921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6098985 + 6098986.

It is an arithmetic number, because the mean of its divisors is an integer number (6098986).

Almost surely, 2^12197971 is an apocalyptic number.

12197971 is a deficient number, since it is larger than the sum of its proper divisors (1).

12197971 is an equidigital number, since it uses as much as digits as its factorization.

12197971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938, while the sum is 37.

The square root of 12197971 is about 3492.5593767322. The cubic root of 12197971 is about 230.1949890251.

The spelling of 12197971 in words is "twelve million, one hundred ninety-seven thousand, nine hundred seventy-one".