1821115098 has 72 divisors (see below), whose sum is σ = 4346623008. Its totient is φ = 550638000.

The previous prime is 1821115061. The next prime is 1821115129. The reversal of 1821115098 is 8905111281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1765843 + ... + 1766873.

It is an arithmetic number, because the mean of its divisors is an integer number (60369764).

Almost surely, 2^1821115098 is an apocalyptic number.

1821115098 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821115098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2173311504).

1821115098 is an abundant number, since it is smaller than the sum of its proper divisors (2525507910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821115098 is a wasteful number, since it uses less digits than its factorization.

1821115098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872 (or 1858 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 36.

The square root of 1821115098 is about 42674.5251643179. The cubic root of 1821115098 is about 1221.1784496913.

The spelling of 1821115098 in words is "one billion, eight hundred twenty-one million, one hundred fifteen thousand, ninety-eight".