1081169681 has 2 divisors, whose sum is σ = 1081169682. Its totient is φ = 1081169680.

The previous prime is 1081169651. The next prime is 1081169701. The reversal of 1081169681 is 1869611801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828518656 + 252651025 = 28784^2 + 15895^2 .

It is an emirp because it is prime and its reverse (1869611801) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1896911801 and 1081196981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081169681 is a prime.

It is a super-2 number, since 2×1081169681² = 2337855758227283522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1081169651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540584840 + 540584841.

It is an arithmetic number, because the mean of its divisors is an integer number (540584841).

Almost surely, 2^1081169681 is an apocalyptic number.

It is an amenable number.

1081169681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081169681 is an equidigital number, since it uses as much as digits as its factorization.

1081169681 is an evil number, because the sum of its binary digits is even.

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

The square root of 1081169681 is about 32881.1447641350. The cubic root of 1081169681 is about 1026.3558281428.

The spelling of 1081169681 in words is "one billion, eighty-one million, one hundred sixty-nine thousand, six hundred eighty-one".