1099218981 has 8 divisors (see below), whose sum is σ = 1675000384. Its totient is φ = 628125120.

The previous prime is 1099218961. The next prime is 1099218983. The reversal of 1099218981 is 1898129901.

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

It is not a de Polignac number, because 1099218981 - 2⁶ = 1099218917 is a prime.

It is a super-2 number, since 2×1099218981² = 2416564736381356722, which contains 22 as substring.

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 1099218981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099218983) 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, 26171860 + ... + 26171901.

It is an arithmetic number, because the mean of its divisors is an integer number (209375048).

Almost surely, 2^1099218981 is an apocalyptic number.

It is an amenable number.

1099218981 is a deficient number, since it is larger than the sum of its proper divisors (575781403).

1099218981 is an equidigital number, since it uses as much as digits as its factorization.

1099218981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52343771.

The product of its (nonzero) digits is 93312, while the sum is 48.

The square root of 1099218981 is about 33154.4715083803. The cubic root of 1099218981 is about 1032.0357453742.

The spelling of 1099218981 in words is "one billion, ninety-nine million, two hundred eighteen thousand, nine hundred eighty-one".