11897121 has 4 divisors (see below), whose sum is σ = 15862832. Its totient is φ = 7931412.

The previous prime is 11897117. The next prime is 11897143. The reversal of 11897121 is 12179811.

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 not a de Polignac number, because 11897121 - 2² = 11897117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11897101) 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, 1982851 + ... + 1982856.

It is an arithmetic number, because the mean of its divisors is an integer number (3965708).

Almost surely, 2^11897121 is an apocalyptic number.

It is an amenable number.

11897121 is a deficient number, since it is larger than the sum of its proper divisors (3965711).

11897121 is an equidigital number, since it uses as much as digits as its factorization.

11897121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965710.

The product of its digits is 1008, while the sum is 30.

The square root of 11897121 is about 3449.2203466871. The cubic root of 11897121 is about 228.2867084132.

The spelling of 11897121 in words is "eleven million, eight hundred ninety-seven thousand, one hundred twenty-one".