1085091681 has 4 divisors (see below), whose sum is σ = 1446788912. Its totient is φ = 723394452.

The previous prime is 1085091661. The next prime is 1085091697. The reversal of 1085091681 is 1861905801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1085091681 - 2⁶ = 1085091617 is a prime.

It is a super-2 number, since 2×1085091681² = 2354847912350811522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1085091641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180848611 + ... + 180848616.

It is an arithmetic number, because the mean of its divisors is an integer number (361697228).

Almost surely, 2^1085091681 is an apocalyptic number.

It is an amenable number.

1085091681 is a deficient number, since it is larger than the sum of its proper divisors (361697231).

1085091681 is an equidigital number, since it uses as much as digits as its factorization.

1085091681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361697230.

The product of its (nonzero) digits is 17280, while the sum is 39.

The square root of 1085091681 is about 32940.7298188732. The cubic root of 1085091681 is about 1027.5953837843.

The spelling of 1085091681 in words is "one billion, eighty-five million, ninety-one thousand, six hundred eighty-one".