1090855865 has 8 divisors (see below), whose sum is σ = 1428029568. Its totient is φ = 793349680.

The previous prime is 1090855859. The next prime is 1090855901. The reversal of 1090855865 is 5685580901.

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

It is not a de Polignac number, because 1090855865 - 2⁴ = 1090855849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9916817 + ... + 9916926.

It is an arithmetic number, because the mean of its divisors is an integer number (178503696).

Almost surely, 2^1090855865 is an apocalyptic number.

It is an amenable number.

1090855865 is a deficient number, since it is larger than the sum of its proper divisors (337173703).

1090855865 is a wasteful number, since it uses less digits than its factorization.

1090855865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19833759.

The product of its (nonzero) digits is 432000, while the sum is 47.

The square root of 1090855865 is about 33028.1071967499. The cubic root of 1090855865 is about 1029.4117560461.

The spelling of 1090855865 in words is "one billion, ninety million, eight hundred fifty-five thousand, eight hundred sixty-five".