1097805985 has 8 divisors (see below), whose sum is σ = 1374644160. Its totient is φ = 840060144.

The previous prime is 1097805977. The next prime is 1097806001. The reversal of 1097805985 is 5895087901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1097805985 - 2³ = 1097805977 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4772955 + ... + 4773184.

It is an arithmetic number, because the mean of its divisors is an integer number (171830520).

Almost surely, 2^1097805985 is an apocalyptic number.

It is an amenable number.

1097805985 is a deficient number, since it is larger than the sum of its proper divisors (276838175).

1097805985 is an equidigital number, since it uses as much as digits as its factorization.

1097805985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546167.

The product of its (nonzero) digits is 907200, while the sum is 52.

The square root of 1097805985 is about 33133.1553734322. The cubic root of 1097805985 is about 1031.5933440889.

The spelling of 1097805985 in words is "one billion, ninety-seven million, eight hundred five thousand, nine hundred eighty-five".