1091281 has 8 divisors (see below), whose sum is σ = 1206144. Its totient is φ = 982080.

The previous prime is 1091273. The next prime is 1091287. The reversal of 1091281 is 1821901.

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 1091281 - 2³ = 1091273 is a prime.

It is a super-2 number, since 2×1091281² = 2381788441922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005 + ... + 1786.

It is an arithmetic number, because the mean of its divisors is an integer number (150768).

2^1091281 is an apocalyptic number.

It is an amenable number.

1091281 is a deficient number, since it is larger than the sum of its proper divisors (114863).

1091281 is a wasteful number, since it uses less digits than its factorization.

1091281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1091281 is about 1044.6439584854. The cubic root of 1091281 is about 102.9545468220.

The spelling of 1091281 in words is "one million, ninety-one thousand, two hundred eighty-one".