671000621 has 4 divisors (see below), whose sum is σ = 677156700. Its totient is φ = 664844544.

The previous prime is 671000581. The next prime is 671000639. The reversal of 671000621 is 126000176.

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

It can be written as a sum of positive squares in 2 ways, for example, as 207072100 + 463928521 = 14390^2 + 21539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671000621 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 (671000651) 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, 3077876 + ... + 3078093.

It is an arithmetic number, because the mean of its divisors is an integer number (169289175).

Almost surely, 2^671000621 is an apocalyptic number.

It is an amenable number.

671000621 is a deficient number, since it is larger than the sum of its proper divisors (6156079).

671000621 is a wasteful number, since it uses less digits than its factorization.

671000621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156078.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 671000621 is about 25903.6796806940. The cubic root of 671000621 is about 875.4694062577.

Adding to 671000621 its reverse (126000176), we get a palindrome (797000797).

The spelling of 671000621 in words is "six hundred seventy-one million, six hundred twenty-one", and thus it is an aban number.