1131601 has 4 divisors (see below), whose sum is σ = 1134900. Its totient is φ = 1128304.

The previous prime is 1131569. The next prime is 1131617. The reversal of 1131601 is 1061311.

It is a happy number.

1131601 is nontrivially palindromic in base 2 and base 4.

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 641601 + 490000 = 801^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131601 - 2⁵ = 1131569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (283725).

2^1131601 is an apocalyptic number.

It is an amenable number.

1131601 is a deficient number, since it is larger than the sum of its proper divisors (3299).

1131601 is an equidigital number, since it uses as much as digits as its factorization.

1131601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1131601 is about 1063.7673617855. The cubic root of 1131601 is about 104.2072113812.

Adding to 1131601 its reverse (1061311), we get a palindrome (2192912).

The spelling of 1131601 in words is "one million, one hundred thirty-one thousand, six hundred one".