671178421 has 8 divisors (see below), whose sum is σ = 679742784. Its totient is φ = 662625600.

The previous prime is 671178413. The next prime is 671178449. The reversal of 671178421 is 124871176.

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 671178421 - 2³ = 671178413 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 (671178451) 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 7 ways as a sum of consecutive naturals, for example, 231040 + ... + 233926.

It is an arithmetic number, because the mean of its divisors is an integer number (84967848).

Almost surely, 2^671178421 is an apocalyptic number.

It is an amenable number.

671178421 is a deficient number, since it is larger than the sum of its proper divisors (8564363).

671178421 is a wasteful number, since it uses less digits than its factorization.

671178421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771.

The product of its digits is 18816, while the sum is 37.

The square root of 671178421 is about 25907.1113982242. Note that the first 3 decimals coincide. The cubic root of 671178421 is about 875.5467259645.

The spelling of 671178421 in words is "six hundred seventy-one million, one hundred seventy-eight thousand, four hundred twenty-one".