11991297 has 8 divisors (see below), whose sum is σ = 16539840. Its totient is φ = 7718480.

The previous prime is 11991271. The next prime is 11991313. The reversal of 11991297 is 79219911.

11991297 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11991297 - 2⁶ = 11991233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11991247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68829 + ... + 69002.

It is an arithmetic number, because the mean of its divisors is an integer number (2067480).

Almost surely, 2^11991297 is an apocalyptic number.

It is an amenable number.

11991297 is a deficient number, since it is larger than the sum of its proper divisors (4548543).

11991297 is a wasteful number, since it uses less digits than its factorization.

11991297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137863.

The product of its digits is 10206, while the sum is 39.

The square root of 11991297 is about 3462.8452174476. The cubic root of 11991297 is about 228.8874881915.

The spelling of 11991297 in words is "eleven million, nine hundred ninety-one thousand, two hundred ninety-seven".