1098305681 has 8 divisors (see below), whose sum is σ = 1199642400. Its totient is φ = 997217440.

The previous prime is 1098305651. The next prime is 1098305687. The reversal of 1098305681 is 1865038901.

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

It is a cyclic number.

It is not a de Polignac number, because 1098305681 - 2⁶ = 1098305617 is a prime.

It is a super-2 number, since 2×1098305681² = 2412550737833747522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1098305687) 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, 52811 + ... + 70608.

It is an arithmetic number, because the mean of its divisors is an integer number (149955300).

Almost surely, 2^1098305681 is an apocalyptic number.

1098305681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1098305681 is a deficient number, since it is larger than the sum of its proper divisors (101336719).

1098305681 is a wasteful number, since it uses less digits than its factorization.

1098305681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124239.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1098305681 is about 33140.6952401424. The cubic root of 1098305681 is about 1031.7498395239.

Subtracting 1098305681 from its reverse (1865038901), we obtain a triangular number (766733220 = T₃₉₁₅₉).

It can be divided in two parts, 109830 and 5681, that added together give a palindrome (115511).

The spelling of 1098305681 in words is "one billion, ninety-eight million, three hundred five thousand, six hundred eighty-one".