671605001 has 4 divisors (see below), whose sum is σ = 671667732. Its totient is φ = 671542272.

The previous prime is 671604979. The next prime is 671605069. The reversal of 671605001 is 100506176.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 61465600 + 610139401 = 7840^2 + 24701^2 .

It is a cyclic number.

It is not a de Polignac number, because 671605001 - 2¹⁸ = 671342857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671605601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10820 + ... + 38213.

It is an arithmetic number, because the mean of its divisors is an integer number (167916933).

Almost surely, 2^671605001 is an apocalyptic number.

It is an amenable number.

671605001 is a deficient number, since it is larger than the sum of its proper divisors (62731).

671605001 is a wasteful number, since it uses less digits than its factorization.

671605001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62730.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 671605001 is about 25915.3429651240. The cubic root of 671605001 is about 875.7321767141.

The spelling of 671605001 in words is "six hundred seventy-one million, six hundred five thousand, one".