1085912531861 has 2 divisors, whose sum is σ = 1085912531862. Its totient is φ = 1085912531860.

The previous prime is 1085912531819. The next prime is 1085912531939. The reversal of 1085912531861 is 1681352195801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757361170225 + 328551361636 = 870265^2 + 573194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085912531861 - 2¹⁰ = 1085912530837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085912530861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542956265930 + 542956265931.

It is an arithmetic number, because the mean of its divisors is an integer number (542956265931).

Almost surely, 2^{1085912531861} is an apocalyptic number.

It is an amenable number.

1085912531861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085912531861 is an equidigital number, since it uses as much as digits as its factorization.

1085912531861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 50.

The spelling of 1085912531861 in words is "one trillion, eighty-five billion, nine hundred twelve million, five hundred thirty-one thousand, eight hundred sixty-one".