1099720913 has 4 divisors (see below), whose sum is σ = 1111058340. Its totient is φ = 1088383488.

The previous prime is 1099720907. The next prime is 1099720933. The reversal of 1099720913 is 3190279901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3190279901 = 23041 ⋅138461.

It can be written as a sum of positive squares in 2 ways, for example, as 347151424 + 752569489 = 18632^2 + 27433^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099720913 - 2¹² = 1099716817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099720933) 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, 5668568 + ... + 5668761.

It is an arithmetic number, because the mean of its divisors is an integer number (277764585).

Almost surely, 2^1099720913 is an apocalyptic number.

It is an amenable number.

1099720913 is a deficient number, since it is larger than the sum of its proper divisors (11337427).

1099720913 is an equidigital number, since it uses as much as digits as its factorization.

1099720913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11337426.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 1099720913 is about 33162.0402418187. The cubic root of 1099720913 is about 1032.1928062658.

The spelling of 1099720913 in words is "one billion, ninety-nine million, seven hundred twenty thousand, nine hundred thirteen".