1164405311981 has 2 divisors, whose sum is σ = 1164405311982. Its totient is φ = 1164405311980.

The previous prime is 1164405311963. The next prime is 1164405312067. The reversal of 1164405311981 is 1891135044611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034409009481 + 129996302500 = 1017059^2 + 360550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1164405311981 - 2⁶ = 1164405311917 is a prime.

It is a super-2 number, since 2×1164405311981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1164405311941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582202655990 + 582202655991.

It is an arithmetic number, because the mean of its divisors is an integer number (582202655991).

Almost surely, 2^{1164405311981} is an apocalyptic number.

It is an amenable number.

1164405311981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1164405311981 is an equidigital number, since it uses as much as digits as its factorization.

1164405311981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 1164405311981 in words is "one trillion, one hundred sixty-four billion, four hundred five million, three hundred eleven thousand, nine hundred eighty-one".