13971197 has 2 divisors, whose sum is σ = 13971198. Its totient is φ = 13971196.

The previous prime is 13971157. The next prime is 13971227. The reversal of 13971197 is 79117931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10106041 + 3865156 = 3179^2 + 1966^2 .

It is an emirp because it is prime and its reverse (79117931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13971197 is a prime.

It is a super-2 number, since 2×13971197² = 390388691225618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13971197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13971157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6985598 + 6985599.

It is an arithmetic number, because the mean of its divisors is an integer number (6985599).

Almost surely, 2^13971197 is an apocalyptic number.

It is an amenable number.

13971197 is a deficient number, since it is larger than the sum of its proper divisors (1).

13971197 is an equidigital number, since it uses as much as digits as its factorization.

13971197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11907, while the sum is 38.

The square root of 13971197 is about 3737.8064422867. The cubic root of 13971197 is about 240.8488288249.

The spelling of 13971197 in words is "thirteen million, nine hundred seventy-one thousand, one hundred ninety-seven".