1130581 has 2 divisors, whose sum is σ = 1130582. Its totient is φ = 1130580.

The previous prime is 1130579. The next prime is 1130587. The reversal of 1130581 is 1850311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654481 + 476100 = 809^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1130581 - 2¹ = 1130579 is a prime.

It is a super-2 number, since 2×1130581² = 2556426795122, which contains 22 as substring.

Together with 1130579, it forms a pair of twin primes.

1130581 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1130587) 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 as a sum of consecutive naturals, namely, 565290 + 565291.

It is an arithmetic number, because the mean of its divisors is an integer number (565291).

2^1130581 is an apocalyptic number.

It is an amenable number.

1130581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1130581 is an equidigital number, since it uses as much as digits as its factorization.

1130581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1130581 is about 1063.2878255675. The cubic root of 1130581 is about 104.1758919474.

Adding to 1130581 its reverse (1850311), we get a palindrome (2980892).

It can be divided in two parts, 1130 and 581, that added together give a triangular number (1711 = T₅₈).

The spelling of 1130581 in words is "one million, one hundred thirty thousand, five hundred eighty-one".