11801281 has 4 divisors (see below), whose sum is σ = 12495492. Its totient is φ = 11107072.

The previous prime is 11801269. The next prime is 11801287. The reversal of 11801281 is 18210811.

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 6890625 + 4910656 = 2625^2 + 2216^2 .

It is a cyclic number.

It is not a de Polignac number, because 11801281 - 2¹⁵ = 11768513 is a prime.

It is a super-2 number, since 2×11801281² = 278540466481922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11801287) 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, 347080 + ... + 347113.

It is an arithmetic number, because the mean of its divisors is an integer number (3123873).

Almost surely, 2^11801281 is an apocalyptic number.

It is an amenable number.

11801281 is a deficient number, since it is larger than the sum of its proper divisors (694211).

11801281 is an equidigital number, since it uses as much as digits as its factorization.

11801281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694210.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 11801281 is about 3435.2992591621. The cubic root of 11801281 is about 227.6720495412.

The spelling of 11801281 in words is "eleven million, eight hundred one thousand, two hundred eighty-one".