671221917 has 16 divisors (see below), whose sum is σ = 994840000. Its totient is φ = 447284592.

The previous prime is 671221871. The next prime is 671221939. The reversal of 671221917 is 719122176.

It is a happy number.

It is not a de Polignac number, because 671221917 - 2⁶ = 671221853 is a prime.

It is a super-2 number, since 2×671221917² = 901077723722309778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671221997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83334 + ... + 91032.

It is an arithmetic number, because the mean of its divisors is an integer number (62177500).

Almost surely, 2^671221917 is an apocalyptic number.

It is an amenable number.

671221917 is a deficient number, since it is larger than the sum of its proper divisors (323618083).

671221917 is a wasteful number, since it uses less digits than its factorization.

671221917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10937 (or 10931 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 671221917 is about 25907.9508452521. The cubic root of 671221917 is about 875.5656389473.

The spelling of 671221917 in words is "six hundred seventy-one million, two hundred twenty-one thousand, nine hundred seventeen".