855819491 has 8 divisors (see below), whose sum is σ = 914632560. Its totient is φ = 797947648.

The previous prime is 855819479. The next prime is 855819499. The reversal of 855819491 is 194918558.

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 855819491 - 2⁶ = 855819427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855819499) by changing a digit.

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, 233426 + ... + 237063.

It is an arithmetic number, because the mean of its divisors is an integer number (114329070).

Almost surely, 2^855819491 is an apocalyptic number.

855819491 is a deficient number, since it is larger than the sum of its proper divisors (58813069).

855819491 is a wasteful number, since it uses less digits than its factorization.

855819491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470613.

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

The square root of 855819491 is about 29254.3926787072. The cubic root of 855819491 is about 949.4251336461.

The spelling of 855819491 in words is "eight hundred fifty-five million, eight hundred nineteen thousand, four hundred ninety-one".