671846401 has 4 divisors (see below), whose sum is σ = 672164100. Its totient is φ = 671528704.

The previous prime is 671846389. The next prime is 671846411. The reversal of 671846401 is 104648176.

It is a happy number.

It is a Cunningham number, because it is equal to 25920²+1.

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 170041600 + 501804801 = 13040^2 + 22401^2 .

It is a cyclic number.

It is not a de Polignac number, because 671846401 - 2¹¹ = 671844353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671846411) 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, 155656 + ... + 159913.

It is an arithmetic number, because the mean of its divisors is an integer number (168041025).

Almost surely, 2^671846401 is an apocalyptic number.

It is an amenable number.

671846401 is a deficient number, since it is larger than the sum of its proper divisors (317699).

671846401 is a wasteful number, since it uses less digits than its factorization.

671846401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317698.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 671846401 is about 25920.0000192901. Note that the first 4 decimals coincide. The cubic root of 671846401 is about 875.8370877971.

The spelling of 671846401 in words is "six hundred seventy-one million, eight hundred forty-six thousand, four hundred one".