1098667681 has 2 divisors, whose sum is σ = 1098667682. Its totient is φ = 1098667680.

The previous prime is 1098667679. The next prime is 1098667711. The reversal of 1098667681 is 1867668901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996980625 + 101687056 = 31575^2 + 10084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098667681 - 2¹ = 1098667679 is a prime.

It is a super-2 number, since 2×1098667681² = 2414141346547835522, which contains 22 as substring.

Together with 1098667679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1098667601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549333840 + 549333841.

It is an arithmetic number, because the mean of its divisors is an integer number (549333841).

Almost surely, 2^1098667681 is an apocalyptic number.

It is an amenable number.

1098667681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098667681 is an equidigital number, since it uses as much as digits as its factorization.

1098667681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 1098667681 is about 33146.1563533391. The cubic root of 1098667681 is about 1031.8631815019.

The spelling of 1098667681 in words is "one billion, ninety-eight million, six hundred sixty-seven thousand, six hundred eighty-one".