671980913 has 8 divisors (see below), whose sum is σ = 723569760. Its totient is φ = 621732160.

The previous prime is 671980891. The next prime is 671980921. The reversal of 671980913 is 319089176.

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

It is not a de Polignac number, because 671980913 - 2¹² = 671976817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671980943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333983 + ... + 335988.

It is an arithmetic number, because the mean of its divisors is an integer number (90446220).

Almost surely, 2^671980913 is an apocalyptic number.

It is an amenable number.

671980913 is a deficient number, since it is larger than the sum of its proper divisors (51588847).

671980913 is a wasteful number, since it uses less digits than its factorization.

671980913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670047.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 671980913 is about 25922.5946425122. The cubic root of 671980913 is about 875.8955350536.

The spelling of 671980913 in words is "six hundred seventy-one million, nine hundred eighty thousand, nine hundred thirteen".