1081186681 has 2 divisors, whose sum is σ = 1081186682. Its totient is φ = 1081186680.

The previous prime is 1081186679. The next prime is 1081186709. The reversal of 1081186681 is 1866811801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 935381056 + 145805625 = 30584^2 + 12075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081186681 - 2¹ = 1081186679 is a prime.

It is a super-2 number, since 2×1081186681² = 2337929278343591522, which contains 22 as substring.

Together with 1081186679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1081186081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540593340 + 540593341.

It is an arithmetic number, because the mean of its divisors is an integer number (540593341).

Almost surely, 2^1081186681 is an apocalyptic number.

It is an amenable number.

1081186681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081186681 is an equidigital number, since it uses as much as digits as its factorization.

1081186681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 40.

The square root of 1081186681 is about 32881.4032699336. The cubic root of 1081186681 is about 1026.3612074888.

The spelling of 1081186681 in words is "one billion, eighty-one million, one hundred eighty-six thousand, six hundred eighty-one".