1097699209 has 8 divisors (see below), whose sum is σ = 1126747080. Its totient is φ = 1069008000.

The previous prime is 1097699177. The next prime is 1097699221. The reversal of 1097699209 is 9029967901.

It can be written as a sum of positive squares in 4 ways, for example, as 67289209 + 1030410000 = 8203^2 + 32100^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1097699209 - 2⁵ = 1097699177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097699249) 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, 82924 + ... + 95245.

It is an arithmetic number, because the mean of its divisors is an integer number (140843385).

Almost surely, 2^1097699209 is an apocalyptic number.

It is an amenable number.

1097699209 is a deficient number, since it is larger than the sum of its proper divisors (29047871).

1097699209 is a wasteful number, since it uses less digits than its factorization.

1097699209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178331.

The product of its (nonzero) digits is 551124, while the sum is 52.

The square root of 1097699209 is about 33131.5440177484. The cubic root of 1097699209 is about 1031.5598976865.

The spelling of 1097699209 in words is "one billion, ninety-seven million, six hundred ninety-nine thousand, two hundred nine".