856806519 has 16 divisors (see below), whose sum is σ = 1186435712. Its totient is φ = 549587808.

The previous prime is 856806499. The next prime is 856806541. The reversal of 856806519 is 915608658.

It is not a de Polignac number, because 856806519 - 2¹² = 856802423 is a prime.

It is a super-2 number, since 2×856806519² = 1468234822001794722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856807519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40924 + ... + 58209.

It is an arithmetic number, because the mean of its divisors is an integer number (74152232).

Almost surely, 2^856806519 is an apocalyptic number.

856806519 is a deficient number, since it is larger than the sum of its proper divisors (329629193).

856806519 is a wasteful number, since it uses less digits than its factorization.

856806519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99246.

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 856806519 is about 29271.2575575427. The cubic root of 856806519 is about 949.7899882956.

The spelling of 856806519 in words is "eight hundred fifty-six million, eight hundred six thousand, five hundred nineteen".