1108987731581 has 2 divisors, whose sum is σ = 1108987731582. Its totient is φ = 1108987731580.

The previous prime is 1108987731451. The next prime is 1108987731613. The reversal of 1108987731581 is 1851377898011.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1108408896100 + 578835481 = 1052810^2 + 24059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1108987731581 - 2¹⁴ = 1108987715197 is a prime.

It is a super-2 number, since 2×1108987731581² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1108987731581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1108987730581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554493865790 + 554493865791.

It is an arithmetic number, because the mean of its divisors is an integer number (554493865791).

Almost surely, 2^{1108987731581} is an apocalyptic number.

It is an amenable number.

1108987731581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1108987731581 is an equidigital number, since it uses as much as digits as its factorization.

1108987731581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 59.

The spelling of 1108987731581 in words is "one trillion, one hundred eight billion, nine hundred eighty-seven million, seven hundred thirty-one thousand, five hundred eighty-one".