1198273491 has 6 divisors (see below), whose sum is σ = 1730839500. Its totient is φ = 798848988.

The previous prime is 1198273471. The next prime is 1198273523. The reversal of 1198273491 is 1943728911.

1198273491 is a `hidden beast` number, since 1 + 1 + 98 + 2 + 73 + 491 = 666.

It is not a de Polignac number, because 1198273491 - 2⁵ = 1198273459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1198273471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66570741 + ... + 66570758.

It is an arithmetic number, because the mean of its divisors is an integer number (288473250).

Almost surely, 2^1198273491 is an apocalyptic number.

1198273491 is a deficient number, since it is larger than the sum of its proper divisors (532566009).

1198273491 is a wasteful number, since it uses less digits than its factorization.

1198273491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133141505 (or 133141502 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1198273491 is about 34616.0871705628. The cubic root of 1198273491 is about 1062.1486885774.

The spelling of 1198273491 in words is "one billion, one hundred ninety-eight million, two hundred seventy-three thousand, four hundred ninety-one".