11971397 has 2 divisors, whose sum is σ = 11971398. Its totient is φ = 11971396.

The previous prime is 11971373. The next prime is 11971409. The reversal of 11971397 is 79317911.

11971397 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6584356 + 5387041 = 2566^2 + 2321^2 .

It is a cyclic number.

It is not a de Polignac number, because 11971397 - 2¹² = 11967301 is a prime.

It is a super-2 number, since 2×11971397² = 286628692263218, which contains 22 as substring.

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 11971397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11971327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5985698 + 5985699.

It is an arithmetic number, because the mean of its divisors is an integer number (5985699).

Almost surely, 2^11971397 is an apocalyptic number.

It is an amenable number.

11971397 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971397 is an equidigital number, since it uses as much as digits as its factorization.

11971397 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11971397 is about 3459.9706646155. The cubic root of 11971397 is about 228.7608023406.

The spelling of 11971397 in words is "eleven million, nine hundred seventy-one thousand, three hundred ninety-seven".