1099681379 has 4 divisors (see below), whose sum is σ = 1100270376. Its totient is φ = 1099092384.

The previous prime is 1099681339. The next prime is 1099681381. The reversal of 1099681379 is 9731869901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1099681379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1099681379.

It is not an unprimeable number, because it can be changed into a prime (1099681339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291689 + ... + 295434.

It is an arithmetic number, because the mean of its divisors is an integer number (275067594).

Almost surely, 2^1099681379 is an apocalyptic number.

1099681379 is a deficient number, since it is larger than the sum of its proper divisors (588997).

1099681379 is an equidigital number, since it uses as much as digits as its factorization.

1099681379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588996.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 1099681379 is about 33161.4441633654. Note that the first 3 decimals coincide. The cubic root of 1099681379 is about 1032.1804373096.

The spelling of 1099681379 in words is "one billion, ninety-nine million, six hundred eighty-one thousand, three hundred seventy-nine".