1081196981 has 2 divisors, whose sum is σ = 1081196982. Its totient is φ = 1081196980.

The previous prime is 1081196971. The next prime is 1081196989. The reversal of 1081196981 is 1896911801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 965096356 + 116100625 = 31066^2 + 10775^2 .

It is an emirp because it is prime and its reverse (1896911801) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1869611801 and 1081169681.

It is a cyclic number.

It is not a de Polignac number, because 1081196981 - 2¹⁰ = 1081195957 is a prime.

It is a super-2 number, since 2×1081196981² = 2337973823447028722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081196989) 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, 540598490 + 540598491.

It is an arithmetic number, because the mean of its divisors is an integer number (540598491).

Almost surely, 2^1081196981 is an apocalyptic number.

It is an amenable number.

1081196981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081196981 is an equidigital number, since it uses as much as digits as its factorization.

1081196981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 44.

The square root of 1081196981 is about 32881.5598930464. The cubic root of 1081196981 is about 1026.3644667123.

The spelling of 1081196981 in words is "one billion, eighty-one million, one hundred ninety-six thousand, nine hundred eighty-one".