670831861 has 4 divisors (see below), whose sum is σ = 766664992. Its totient is φ = 574998732.

The previous prime is 670831859. The next prime is 670831901. The reversal of 670831861 is 168138076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 670831861 - 2¹ = 670831859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670831831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47916555 + ... + 47916568.

It is an arithmetic number, because the mean of its divisors is an integer number (191666248).

Almost surely, 2^670831861 is an apocalyptic number.

It is an amenable number.

670831861 is a deficient number, since it is larger than the sum of its proper divisors (95833131).

670831861 is an equidigital number, since it uses as much as digits as its factorization.

670831861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95833130.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 670831861 is about 25900.4220235887. The cubic root of 670831861 is about 875.3960051310.

The spelling of 670831861 in words is "six hundred seventy million, eight hundred thirty-one thousand, eight hundred sixty-one".