670651 has 4 divisors (see below), whose sum is σ = 679912. Its totient is φ = 661392.

The previous prime is 670639. The next prime is 670669. The reversal of 670651 is 156076.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 670651 - 2⁵ = 670619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4521 + ... + 4666.

It is an arithmetic number, because the mean of its divisors is an integer number (169978).

2⁶⁷⁰⁶⁵¹ is an apocalyptic number.

670651 is a deficient number, since it is larger than the sum of its proper divisors (9261).

670651 is an equidigital number, since it uses as much as digits as its factorization.

670651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 670651 is about 818.9328421794. The cubic root of 670651 is about 87.5317327081.

The spelling of 670651 in words is "six hundred seventy thousand, six hundred fifty-one".