1198147491 has 8 divisors (see below), whose sum is σ = 1775033360. Its totient is φ = 798764976.

The previous prime is 1198147477. The next prime is 1198147493. The reversal of 1198147491 is 1947418911.

1198147491 is a `hidden beast` number, since 1 + 1 + 98 + 1 + 474 + 91 = 666.

It is not a de Polignac number, because 1198147491 - 2⁹ = 1198146979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198147493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22187890 + ... + 22187943.

It is an arithmetic number, because the mean of its divisors is an integer number (221879170).

Almost surely, 2^1198147491 is an apocalyptic number.

1198147491 is a deficient number, since it is larger than the sum of its proper divisors (576885869).

1198147491 is an equidigital number, since it uses as much as digits as its factorization.

1198147491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44375842 (or 44375836 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 1198147491 is about 34614.2671596554. The cubic root of 1198147491 is about 1062.1114585052. Note that the first 3 decimals are identical.

The spelling of 1198147491 in words is "one billion, one hundred ninety-eight million, one hundred forty-seven thousand, four hundred ninety-one".