1198581 has 4 divisors (see below), whose sum is σ = 1598112. Its totient is φ = 799052.

The previous prime is 1198537. The next prime is 1198583. The reversal of 1198581 is 1858911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1198581 - 2⁹ = 1198069 is a prime.

It is a super-2 number, since 2×1198581² = 2873192827122, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199761 + ... + 199766.

It is an arithmetic number, because the mean of its divisors is an integer number (399528).

2^1198581 is an apocalyptic number.

It is an amenable number.

1198581 is a deficient number, since it is larger than the sum of its proper divisors (399531).

1198581 is an equidigital number, since it uses as much as digits as its factorization.

1198581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399530.

The product of its digits is 2880, while the sum is 33.

The square root of 1198581 is about 1094.7972415018. The cubic root of 1198581 is about 106.2239539386.

The spelling of 1198581 in words is "one million, one hundred ninety-eight thousand, five hundred eighty-one".