671808101 has 4 divisors (see below), whose sum is σ = 675831072. Its totient is φ = 667785132.

The previous prime is 671808077. The next prime is 671808121. The reversal of 671808101 is 101808176.

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 a cyclic number.

It is not a de Polignac number, because 671808101 - 2¹⁸ = 671545957 is a prime.

It is a super-2 number, since 2×671808101² = 902652249138452402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671808121) 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, 2011235 + ... + 2011568.

It is an arithmetic number, because the mean of its divisors is an integer number (168957768).

Almost surely, 2^671808101 is an apocalyptic number.

It is an amenable number.

671808101 is a deficient number, since it is larger than the sum of its proper divisors (4022971).

671808101 is a wasteful number, since it uses less digits than its factorization.

671808101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022970.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 671808101 is about 25919.2611970326. The cubic root of 671808101 is about 875.8204445099.

The spelling of 671808101 in words is "six hundred seventy-one million, eight hundred eight thousand, one hundred one".