1188581 has 2 divisors, whose sum is σ = 1188582. Its totient is φ = 1188580.

The previous prime is 1188559. The next prime is 1188587. The reversal of 1188581 is 1858811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1144900 + 43681 = 1070^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188581 - 2¹⁸ = 926437 is a prime.

It is a super-2 number, since 2×1188581² = 2825449587122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1188587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594290 + 594291.

It is an arithmetic number, because the mean of its divisors is an integer number (594291).

2^1188581 is an apocalyptic number.

It is an amenable number.

1188581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188581 is an equidigital number, since it uses as much as digits as its factorization.

1188581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 32.

The square root of 1188581 is about 1090.2206198747. The cubic root of 1188581 is about 105.9277126701.

The spelling of 1188581 in words is "one million, one hundred eighty-eight thousand, five hundred eighty-one".