671440471 has 4 divisors (see below), whose sum is σ = 723089752. Its totient is φ = 619791192.

The previous prime is 671440459. The next prime is 671440493. The reversal of 671440471 is 174044176.

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

It is a cyclic number.

It is not a de Polignac number, because 671440471 - 2⁹ = 671439959 is a prime.

It is a super-3 number, since 3×671440471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671440171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25824621 + ... + 25824646.

It is an arithmetic number, because the mean of its divisors is an integer number (180772438).

Almost surely, 2^671440471 is an apocalyptic number.

671440471 is a deficient number, since it is larger than the sum of its proper divisors (51649281).

671440471 is a wasteful number, since it uses less digits than its factorization.

671440471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51649280.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 671440471 is about 25912.1683963346. The cubic root of 671440471 is about 875.6606584942.

The spelling of 671440471 in words is "six hundred seventy-one million, four hundred forty thousand, four hundred seventy-one".