855217897 has 8 divisors (see below), whose sum is σ = 867335040. Its totient is φ = 843133200.

The previous prime is 855217843. The next prime is 855217943. The reversal of 855217897 is 798712558.

It is a happy number.

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 855217897 - 2²³ = 846829289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855217817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47658 + ... + 63100.

It is an arithmetic number, because the mean of its divisors is an integer number (108416880).

Almost surely, 2^855217897 is an apocalyptic number.

It is an amenable number.

855217897 is a deficient number, since it is larger than the sum of its proper divisors (12117143).

855217897 is a wasteful number, since it uses less digits than its factorization.

855217897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16223.

The product of its digits is 1411200, while the sum is 52.

The square root of 855217897 is about 29244.1087571497. The cubic root of 855217897 is about 949.2026169606.

The spelling of 855217897 in words is "eight hundred fifty-five million, two hundred seventeen thousand, eight hundred ninety-seven".