852991217 has 8 divisors (see below), whose sum is σ = 920206056. Its totient is φ = 786004992.

The previous prime is 852991193. The next prime is 852991259. The reversal of 852991217 is 712199258.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 370793536 + 482197681 = 19256^2 + 21959^2 .

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 852991217 - 2⁸ = 852990961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (852991417) 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, 49358 + ... + 64359.

It is an arithmetic number, because the mean of its divisors is an integer number (115025757).

Almost surely, 2^852991217 is an apocalyptic number.

It is an amenable number.

852991217 is a deficient number, since it is larger than the sum of its proper divisors (67214839).

852991217 is a wasteful number, since it uses less digits than its factorization.

852991217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114307.

The product of its digits is 90720, while the sum is 44.

The square root of 852991217 is about 29206.0133705372. The cubic root of 852991217 is about 948.3781068272.

The spelling of 852991217 in words is "eight hundred fifty-two million, nine hundred ninety-one thousand, two hundred seventeen".