671381217 has 40 divisors (see below), whose sum is σ = 1084397160. Its totient is φ = 411505920.

The previous prime is 671381213. The next prime is 671381257. The reversal of 671381217 is 712183176.

671381217 is a `hidden beast` number, since 67 + 1 + 381 + 217 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1296 + 671379921 = 36^2 + 25911^2 .

It is not a de Polignac number, because 671381217 - 2² = 671381213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671381213) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 294759 + ... + 297027.

It is an arithmetic number, because the mean of its divisors is an integer number (27109929).

Almost surely, 2^671381217 is an apocalyptic number.

It is an amenable number.

671381217 is a deficient number, since it is larger than the sum of its proper divisors (413015943).

671381217 is a wasteful number, since it uses less digits than its factorization.

671381217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575 (or 2566 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 671381217 is about 25911.0250086715. The cubic root of 671381217 is about 875.6348989889.

The spelling of 671381217 in words is "six hundred seventy-one million, three hundred eighty-one thousand, two hundred seventeen".