1197709409 has 8 divisors (see below), whose sum is σ = 1302613032. Its totient is φ = 1094630400.

The previous prime is 1197709379. The next prime is 1197709411. The reversal of 1197709409 is 9049077911.

It can be written as a sum of positive squares in 4 ways, for example, as 308775184 + 888934225 = 17572^2 + 29815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1197709409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1197709489) 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, 454784 + ... + 457409.

It is an arithmetic number, because the mean of its divisors is an integer number (162826629).

Almost surely, 2^1197709409 is an apocalyptic number.

It is an amenable number.

1197709409 is a deficient number, since it is larger than the sum of its proper divisors (104903623).

1197709409 is a wasteful number, since it uses less digits than its factorization.

1197709409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912307.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 1197709409 is about 34607.9385257198. The cubic root of 1197709409 is about 1061.9819951362.

The spelling of 1197709409 in words is "one billion, one hundred ninety-seven million, seven hundred nine thousand, four hundred nine".