1151281 has 4 divisors (see below), whose sum is σ = 1158772. Its totient is φ = 1143792.

The previous prime is 1151251. The next prime is 1151287. The reversal of 1151281 is 1821511.

It is a happy number.

1151281 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1821511 = 19 ⋅95869.

It can be written as a sum of positive squares in 2 ways, for example, as 119025 + 1032256 = 345^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151281 - 2⁹ = 1150769 is a prime.

It is a super-2 number, since 2×1151281² = 2650895881922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151287) 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, 3510 + ... + 3823.

It is an arithmetic number, because the mean of its divisors is an integer number (289693).

2^1151281 is an apocalyptic number.

It is an amenable number.

1151281 is a deficient number, since it is larger than the sum of its proper divisors (7491).

1151281 is an equidigital number, since it uses as much as digits as its factorization.

1151281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490.

The product of its digits is 80, while the sum is 19.

The square root of 1151281 is about 1072.9776325721. The cubic root of 1151281 is about 104.8078420506.

Adding to 1151281 its reverse (1821511), we get a palindrome (2972792).

The spelling of 1151281 in words is "one million, one hundred fifty-one thousand, two hundred eighty-one".