1098764981 has 2 divisors, whose sum is σ = 1098764982. Its totient is φ = 1098764980.

The previous prime is 1098764969. The next prime is 1098765007. The reversal of 1098764981 is 1894678901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034908900 + 63856081 = 32170^2 + 7991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098764981 - 2¹⁰ = 1098763957 is a prime.

It is a super-2 number, since 2×1098764981² = 2414568966943860722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098764941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549382490 + 549382491.

It is an arithmetic number, because the mean of its divisors is an integer number (549382491).

Almost surely, 2^1098764981 is an apocalyptic number.

It is an amenable number.

1098764981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098764981 is an equidigital number, since it uses as much as digits as its factorization.

1098764981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 1098764981 is about 33147.6240626685. The cubic root of 1098764981 is about 1031.8936418269.

The spelling of 1098764981 in words is "one billion, ninety-eight million, seven hundred sixty-four thousand, nine hundred eighty-one".