1099726889 has 4 divisors (see below), whose sum is σ = 1164416724. Its totient is φ = 1035037056.

The previous prime is 1099726883. The next prime is 1099726907. The reversal of 1099726889 is 9886279901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9886279901 = 56773 ⋅174137.

It can be written as a sum of positive squares in 2 ways, for example, as 766846864 + 332880025 = 27692^2 + 18245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099726889 - 2²⁰ = 1098678313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099726883) 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, 32344892 + ... + 32344925.

It is an arithmetic number, because the mean of its divisors is an integer number (291104181).

Almost surely, 2^1099726889 is an apocalyptic number.

It is an amenable number.

1099726889 is a deficient number, since it is larger than the sum of its proper divisors (64689835).

1099726889 is an equidigital number, since it uses as much as digits as its factorization.

1099726889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64689834.

The product of its (nonzero) digits is 3919104, while the sum is 59.

The square root of 1099726889 is about 33162.1303447170. The cubic root of 1099726889 is about 1032.1946759441.

The spelling of 1099726889 in words is "one billion, ninety-nine million, seven hundred twenty-six thousand, eight hundred eighty-nine".