1098122981 has 2 divisors, whose sum is σ = 1098122982. Its totient is φ = 1098122980.

The previous prime is 1098122969. The next prime is 1098122999. The reversal of 1098122981 is 1892218901.

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., 1032593956 + 65529025 = 32134^2 + 8095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098122981 - 2³⁰ = 24381157 is a prime.

It is a super-2 number, since 2×1098122981² = 2411748162800652722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098122911) 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 as a sum of consecutive naturals, namely, 549061490 + 549061491.

It is an arithmetic number, because the mean of its divisors is an integer number (549061491).

Almost surely, 2^1098122981 is an apocalyptic number.

It is an amenable number.

1098122981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098122981 is an equidigital number, since it uses as much as digits as its factorization.

1098122981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 1098122981 is about 33137.9386957004. The cubic root of 1098122981 is about 1031.6926268091.

The spelling of 1098122981 in words is "one billion, ninety-eight million, one hundred twenty-two thousand, nine hundred eighty-one".