1098479891 has 4 divisors (see below), whose sum is σ = 1099598352. Its totient is φ = 1097361432.

The previous prime is 1098479867. The next prime is 1098479897. The reversal of 1098479891 is 1989748901.

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

It is a cyclic number.

It is not a de Polignac number, because 1098479891 - 2⁶ = 1098479827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1098479897) 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, 557756 + ... + 559721.

It is an arithmetic number, because the mean of its divisors is an integer number (274899588).

Almost surely, 2^1098479891 is an apocalyptic number.

1098479891 is a deficient number, since it is larger than the sum of its proper divisors (1118461).

1098479891 is an equidigital number, since it uses as much as digits as its factorization.

1098479891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118460.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The square root of 1098479891 is about 33143.3234754754. The cubic root of 1098479891 is about 1031.8043876763.

The spelling of 1098479891 in words is "one billion, ninety-eight million, four hundred seventy-nine thousand, eight hundred ninety-one".