671131555 has 8 divisors (see below), whose sum is σ = 831337344. Its totient is φ = 519585600.

The previous prime is 671131519. The next prime is 671131579. The reversal of 671131555 is 555131176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-671131555 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671131555.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2164786 + ... + 2165095.

It is an arithmetic number, because the mean of its divisors is an integer number (103917168).

Almost surely, 2^671131555 is an apocalyptic number.

671131555 is a deficient number, since it is larger than the sum of its proper divisors (160205789).

671131555 is a wasteful number, since it uses less digits than its factorization.

671131555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4329917.

The product of its digits is 15750, while the sum is 34.

The square root of 671131555 is about 25906.2068817494. The cubic root of 671131555 is about 875.5263467197.

The spelling of 671131555 in words is "six hundred seventy-one million, one hundred thirty-one thousand, five hundred fifty-five".