671881401 has 12 divisors (see below), whose sum is σ = 1021574320. Its totient is φ = 424346040.

The previous prime is 671881369. The next prime is 671881411. The reversal of 671881401 is 104188176.

It is not a de Polignac number, because 671881401 - 2⁵ = 671881369 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 (671881411) 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 11 ways as a sum of consecutive naturals, for example, 1964395 + ... + 1964736.

Almost surely, 2^671881401 is an apocalyptic number.

It is an amenable number.

671881401 is a deficient number, since it is larger than the sum of its proper divisors (349692919).

671881401 is a wasteful number, since it uses less digits than its factorization.

671881401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929156 (or 3929153 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 671881401 is about 25920.6751648178. The cubic root of 671881401 is about 875.8522965143.

The spelling of 671881401 in words is "six hundred seventy-one million, eight hundred eighty-one thousand, four hundred one".