1098785121 has 8 divisors (see below), whose sum is σ = 1674339264. Its totient is φ = 627877200.

The previous prime is 1098785113. The next prime is 1098785183. The reversal of 1098785121 is 1215878901.

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

It is not a de Polignac number, because 1098785121 - 2³ = 1098785113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1098785521) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 26161530 + ... + 26161571.

It is an arithmetic number, because the mean of its divisors is an integer number (209292408).

Almost surely, 2^1098785121 is an apocalyptic number.

It is an amenable number.

1098785121 is a deficient number, since it is larger than the sum of its proper divisors (575554143).

1098785121 is an equidigital number, since it uses as much as digits as its factorization.

1098785121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52323111.

The product of its (nonzero) digits is 40320, while the sum is 42.

The square root of 1098785121 is about 33147.9278537890. The cubic root of 1098785121 is about 1031.8999465451.

The spelling of 1098785121 in words is "one billion, ninety-eight million, seven hundred eighty-five thousand, one hundred twenty-one".