1197381609 has 20 divisors (see below), whose sum is σ = 1850363460. Its totient is φ = 770726880.

The previous prime is 1197381583. The next prime is 1197381611. The reversal of 1197381609 is 9061837911.

1197381609 is a `hidden beast` number, since 1 + 1 + 9 + 7 + 38 + 1 + 609 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 431475984 + 765905625 = 20772^2 + 27675^2 .

It is not a de Polignac number, because 1197381609 - 2⁷ = 1197381481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1197381629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 252522 + ... + 257219.

It is an arithmetic number, because the mean of its divisors is an integer number (92518173).

Almost surely, 2^1197381609 is an apocalyptic number.

It is an amenable number.

1197381609 is a deficient number, since it is larger than the sum of its proper divisors (652981851).

1197381609 is an equidigital number, since it uses as much as digits as its factorization.

1197381609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509782 (or 509773 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 1197381609 is about 34603.2022940074. The cubic root of 1197381609 is about 1061.8851020003.

The spelling of 1197381609 in words is "one billion, one hundred ninety-seven million, three hundred eighty-one thousand, six hundred nine".