11287897 has 4 divisors (see below), whose sum is σ = 11305636. Its totient is φ = 11270160.

The previous prime is 11287891. The next prime is 11287921. The reversal of 11287897 is 79878211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79878211 = 7 ⋅11411173.

It can be written as a sum of positive squares in 2 ways, for example, as 7027801 + 4260096 = 2651^2 + 2064^2 .

It is a cyclic number.

It is not a de Polignac number, because 11287897 - 2⁷ = 11287769 is a prime.

It is a super-3 number, since 3×11287897³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11287891) 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 in 3 ways as a sum of consecutive naturals, for example, 7878 + ... + 9199.

It is an arithmetic number, because the mean of its divisors is an integer number (2826409).

Almost surely, 2^11287897 is an apocalyptic number.

It is an amenable number.

11287897 is a deficient number, since it is larger than the sum of its proper divisors (17739).

11287897 is an equidigital number, since it uses as much as digits as its factorization.

11287897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17738.

The product of its digits is 56448, while the sum is 43.

The square root of 11287897 is about 3359.7465678232. The cubic root of 11287897 is about 224.3215579976.

It can be divided in two parts, 1128 and 7897, that added together give a square (9025 = 95²).

The spelling of 11287897 in words is "eleven million, two hundred eighty-seven thousand, eight hundred ninety-seven".