1198591 has 4 divisors (see below), whose sum is σ = 1209312. Its totient is φ = 1187872.

The previous prime is 1198583. The next prime is 1198607. The reversal of 1198591 is 1958911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1958911 = 1367 ⋅1433.

It is a cyclic number.

It is not a de Polignac number, because 1198591 - 2³ = 1198583 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8 and base 16.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5191 + ... + 5416.

It is an arithmetic number, because the mean of its divisors is an integer number (302328).

2^1198591 is an apocalyptic number.

1198591 is a deficient number, since it is larger than the sum of its proper divisors (10721).

1198591 is a wasteful number, since it uses less digits than its factorization.

1198591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10720.

The product of its digits is 3240, while the sum is 34.

The square root of 1198591 is about 1094.8018085480. The cubic root of 1198591 is about 106.2242493536.

The spelling of 1198591 in words is "one million, one hundred ninety-eight thousand, five hundred ninety-one".