1081991901827 has 2 divisors, whose sum is σ = 1081991901828. Its totient is φ = 1081991901826.

The previous prime is 1081991901751. The next prime is 1081991901853. The reversal of 1081991901827 is 7281091991801.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1081991901827 - 2²² = 1081987707523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1081991901227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540995950913 + 540995950914.

It is an arithmetic number, because the mean of its divisors is an integer number (540995950914).

Almost surely, 2^{1081991901827} is an apocalyptic number.

1081991901827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081991901827 is an equidigital number, since it uses as much as digits as its factorization.

1081991901827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 56.

The spelling of 1081991901827 in words is "one trillion, eighty-one billion, nine hundred ninety-one million, nine hundred one thousand, eight hundred twenty-seven".