671521167 has 6 divisors (see below), whose sum is σ = 969975032. Its totient is φ = 447680772.

The previous prime is 671521159. The next prime is 671521181. The reversal of 671521167 is 761125176.

671521167 is a `hidden beast` number, since 6 + 71 + 521 + 1 + 67 = 666.

It is not a de Polignac number, because 671521167 - 2³ = 671521159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671521667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37306723 + ... + 37306740.

Almost surely, 2^671521167 is an apocalyptic number.

671521167 is a deficient number, since it is larger than the sum of its proper divisors (298453865).

671521167 is a wasteful number, since it uses less digits than its factorization.

671521167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74613469 (or 74613466 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 671521167 is about 25913.7254558275. The cubic root of 671521167 is about 875.6957370479.

The spelling of 671521167 in words is "six hundred seventy-one million, five hundred twenty-one thousand, one hundred sixty-seven".