11897281 has 8 divisors (see below), whose sum is σ = 13224384. Its totient is φ = 10611120.

The previous prime is 11897267. The next prime is 11897299. The reversal of 11897281 is 18279811.

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 11897281 - 2²¹ = 9800129 is a prime.

It is a super-2 number, since 2×11897281² = 283090590385922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11897281.

It is not an unprimeable number, because it can be changed into a prime (11897231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9621 + ... + 10786.

It is an arithmetic number, because the mean of its divisors is an integer number (1653048).

Almost surely, 2^11897281 is an apocalyptic number.

11897281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11897281 is a deficient number, since it is larger than the sum of its proper divisors (1327103).

11897281 is a wasteful number, since it uses less digits than its factorization.

11897281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20471.

The product of its digits is 8064, while the sum is 37.

The square root of 11897281 is about 3449.2435402563. The cubic root of 11897281 is about 228.2877317899.

The spelling of 11897281 in words is "eleven million, eight hundred ninety-seven thousand, two hundred eighty-one".