670351691 has 4 divisors (see below), whose sum is σ = 670542984. Its totient is φ = 670160400.

The previous prime is 670351679. The next prime is 670351699. The reversal of 670351691 is 196153076.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670351691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670351699) 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, 90290 + ... + 97431.

It is an arithmetic number, because the mean of its divisors is an integer number (167635746).

Almost surely, 2^670351691 is an apocalyptic number.

670351691 is a deficient number, since it is larger than the sum of its proper divisors (191293).

670351691 is a wasteful number, since it uses less digits than its factorization.

670351691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191292.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 670351691 is about 25891.1508241716. The cubic root of 670351691 is about 875.1870907693.

The spelling of 670351691 in words is "six hundred seventy million, three hundred fifty-one thousand, six hundred ninety-one".