671064861 has 4 divisors (see below), whose sum is σ = 894753152. Its totient is φ = 447376572.

The previous prime is 671064847. The next prime is 671064881. The reversal of 671064861 is 168460176.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 671064861 - 2⁷ = 671064733 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 (671064841) 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, 111844141 + ... + 111844146.

It is an arithmetic number, because the mean of its divisors is an integer number (223688288).

Almost surely, 2^671064861 is an apocalyptic number.

It is an amenable number.

671064861 is a deficient number, since it is larger than the sum of its proper divisors (223688291).

671064861 is a wasteful number, since it uses less digits than its factorization.

671064861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223688290.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 671064861 is about 25904.9196292905. The cubic root of 671064861 is about 875.4973438176.

The spelling of 671064861 in words is "six hundred seventy-one million, sixty-four thousand, eight hundred sixty-one".