1085997681 has 12 divisors (see below), whose sum is σ = 1568970000. Its totient is φ = 723856920.

The previous prime is 1085997641. The next prime is 1085997721. The reversal of 1085997681 is 1867995801.

It is an interprime number because it is at equal distance from previous prime (1085997641) and next prime (1085997721).

It is not a de Polignac number, because 1085997681 - 2¹⁷ = 1085866609 is a prime.

It is a super-2 number, since 2×1085997681² = 2358781926274755522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1085997631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59446 + ... + 75536.

It is an arithmetic number, because the mean of its divisors is an integer number (130747500).

Almost surely, 2^1085997681 is an apocalyptic number.

It is an amenable number.

1085997681 is a deficient number, since it is larger than the sum of its proper divisors (482972319).

1085997681 is a wasteful number, since it uses less digits than its factorization.

1085997681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23596 (or 23593 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The square root of 1085997681 is about 32954.4789216883. The cubic root of 1085997681 is about 1027.8813019975.

The spelling of 1085997681 in words is "one billion, eighty-five million, nine hundred ninety-seven thousand, six hundred eighty-one".