2198510981 has 2 divisors, whose sum is σ = 2198510982. Its totient is φ = 2198510980.

The previous prime is 2198510939. The next prime is 2198511011. The reversal of 2198510981 is 1890158912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2172398881 + 26112100 = 46609^2 + 5110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2198510981 is a prime.

It is a super-2 number, since 2×2198510981² = 9666901067155164722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2198510921) 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, 1099255490 + 1099255491.

It is an arithmetic number, because the mean of its divisors is an integer number (1099255491).

Almost surely, 2^2198510981 is an apocalyptic number.

It is an amenable number.

2198510981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2198510981 is an equidigital number, since it uses as much as digits as its factorization.

2198510981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 44.

The square root of 2198510981 is about 46888.2819156343. The cubic root of 2198510981 is about 1300.2979555703.

The spelling of 2198510981 in words is "two billion, one hundred ninety-eight million, five hundred ten thousand, nine hundred eighty-one".