1161281 has 8 divisors (see below), whose sum is σ = 1275744. Its totient is φ = 1048320.

The previous prime is 1161269. The next prime is 1161289. The reversal of 1161281 is 1821611.

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 1161281 - 2⁶ = 1161217 is a prime.

It is a super-2 number, since 2×1161281² = 2697147121922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161289) 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, 1850 + ... + 2396.

It is an arithmetic number, because the mean of its divisors is an integer number (159468).

2^1161281 is an apocalyptic number.

1161281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1161281 is a deficient number, since it is larger than the sum of its proper divisors (114463).

1161281 is a wasteful number, since it uses less digits than its factorization.

1161281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its digits is 96, while the sum is 20.

The square root of 1161281 is about 1077.6274866576. The cubic root of 1161281 is about 105.1104204976.

Adding to 1161281 its reverse (1821611), we get a palindrome (2982892).

The spelling of 1161281 in words is "one million, one hundred sixty-one thousand, two hundred eighty-one".