671916901 has 4 divisors (see below), whose sum is σ = 672641100. Its totient is φ = 671192704.

The previous prime is 671916899. The next prime is 671916907. The reversal of 671916901 is 109619176.

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 268107876 + 403809025 = 16374^2 + 20095^2 .

It is a cyclic number.

It is not a de Polignac number, because 671916901 - 2¹ = 671916899 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 (671916907) 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, 360706 + ... + 362563.

It is an arithmetic number, because the mean of its divisors is an integer number (168160275).

Almost surely, 2^671916901 is an apocalyptic number.

It is an amenable number.

671916901 is a deficient number, since it is larger than the sum of its proper divisors (724199).

671916901 is an equidigital number, since it uses as much as digits as its factorization.

671916901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724198.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 671916901 is about 25921.3599373181. The cubic root of 671916901 is about 875.8677219594.

The spelling of 671916901 in words is "six hundred seventy-one million, nine hundred sixteen thousand, nine hundred one".