1131481 has 4 divisors (see below), whose sum is σ = 1218532. Its totient is φ = 1044432.

The previous prime is 1131479. The next prime is 1131491. The reversal of 1131481 is 1841311.

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 99225 + 1032256 = 315^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131481 - 2¹ = 1131479 is a prime.

It is a super-2 number, since 2×1131481² = 2560498506722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131421) 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, 43506 + ... + 43531.

It is an arithmetic number, because the mean of its divisors is an integer number (304633).

2^1131481 is an apocalyptic number.

It is an amenable number.

1131481 is a deficient number, since it is larger than the sum of its proper divisors (87051).

1131481 is an equidigital number, since it uses as much as digits as its factorization.

1131481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87050.

The product of its digits is 96, while the sum is 19.

The square root of 1131481 is about 1063.7109569803. The cubic root of 1131481 is about 104.2035277190.

Adding to 1131481 its reverse (1841311), we get a palindrome (2972792).

The spelling of 1131481 in words is "one million, one hundred thirty-one thousand, four hundred eighty-one".