11491997 has 4 divisors (see below), whose sum is σ = 12536736. Its totient is φ = 10447260.

The previous prime is 11491993. The next prime is 11491999. The reversal of 11491997 is 79919411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11491997 - 2² = 11491993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11491993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522353 + ... + 522374.

It is an arithmetic number, because the mean of its divisors is an integer number (3134184).

Almost surely, 2^11491997 is an apocalyptic number.

It is an amenable number.

11491997 is a deficient number, since it is larger than the sum of its proper divisors (1044739).

11491997 is a wasteful number, since it uses less digits than its factorization.

11491997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044738.

The product of its digits is 20412, while the sum is 41.

The square root of 11491997 is about 3389.9848082255. The cubic root of 11491997 is about 225.6654996193.

The spelling of 11491997 in words is "eleven million, four hundred ninety-one thousand, nine hundred ninety-seven".