849217645 has 4 divisors (see below), whose sum is σ = 1019061180. Its totient is φ = 679374112.

The previous prime is 849217613. The next prime is 849217703. The reversal of 849217645 is 546712948.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123076836 + 726140809 = 11094^2 + 26947^2 .

It is a cyclic number.

It is not a de Polignac number, because 849217645 - 2⁵ = 849217613 is a prime.

It is a super-3 number, since 3×849217645³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 849217595 and 849217604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84921760 + ... + 84921769.

It is an arithmetic number, because the mean of its divisors is an integer number (254765295).

Almost surely, 2^849217645 is an apocalyptic number.

It is an amenable number.

849217645 is a deficient number, since it is larger than the sum of its proper divisors (169843535).

849217645 is a wasteful number, since it uses less digits than its factorization.

849217645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169843534.

The product of its digits is 483840, while the sum is 46.

The square root of 849217645 is about 29141.3391078722. The cubic root of 849217645 is about 946.9775205067.

The spelling of 849217645 in words is "eight hundred forty-nine million, two hundred seventeen thousand, six hundred forty-five".