11291281 has 4 divisors (see below), whose sum is σ = 11955492. Its totient is φ = 10627072.

The previous prime is 11291261. The next prime is 11291297. The reversal of 11291281 is 18219211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8904256 + 2387025 = 2984^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 11291281 - 2⁵ = 11291249 is a prime.

It is a super-2 number, since 2×11291281² = 254986053241922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11291221) 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, 332080 + ... + 332113.

It is an arithmetic number, because the mean of its divisors is an integer number (2988873).

Almost surely, 2^11291281 is an apocalyptic number.

It is an amenable number.

11291281 is a deficient number, since it is larger than the sum of its proper divisors (664211).

11291281 is an equidigital number, since it uses as much as digits as its factorization.

11291281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664210.

The product of its digits is 288, while the sum is 25.

The square root of 11291281 is about 3360.2501394985. The cubic root of 11291281 is about 224.3439722201.

The spelling of 11291281 in words is "eleven million, two hundred ninety-one thousand, two hundred eighty-one".