671951 has 8 divisors (see below), whose sum is σ = 781440. Its totient is φ = 565848.

The previous prime is 671947. The next prime is 671969. The reversal of 671951 is 159176.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 671951 - 2² = 671947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671951.

It is not an unprimeable number, because it can be changed into a prime (671911) 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, 401 + ... + 1226.

It is an arithmetic number, because the mean of its divisors is an integer number (97680).

2⁶⁷¹⁹⁵¹ is an apocalyptic number.

671951 is a deficient number, since it is larger than the sum of its proper divisors (109489).

671951 is a wasteful number, since it uses less digits than its factorization.

671951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693.

The product of its digits is 1890, while the sum is 29.

The square root of 671951 is about 819.7261737922. The cubic root of 671951 is about 87.5882538131.

The spelling of 671951 in words is "six hundred seventy-one thousand, nine hundred fifty-one".