671342993 has 4 divisors (see below), whose sum is σ = 671912628. Its totient is φ = 670773360.

The previous prime is 671342981. The next prime is 671343089. The reversal of 671342993 is 399243176.

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

It can be written as a sum of positive squares in 2 ways, for example, as 645769744 + 25573249 = 25412^2 + 5057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671342993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671342963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283046 + ... + 285407.

It is an arithmetic number, because the mean of its divisors is an integer number (167978157).

Almost surely, 2^671342993 is an apocalyptic number.

It is an amenable number.

671342993 is a deficient number, since it is larger than the sum of its proper divisors (569635).

671342993 is a wasteful number, since it uses less digits than its factorization.

671342993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569634.

The product of its digits is 244944, while the sum is 44.

The square root of 671342993 is about 25910.2873970938. The cubic root of 671342993 is about 875.6182810562.

The spelling of 671342993 in words is "six hundred seventy-one million, three hundred forty-two thousand, nine hundred ninety-three".