813240671 has 4 divisors (see below), whose sum is σ = 830543712. Its totient is φ = 795937632.

The previous prime is 813240667. The next prime is 813240683. The reversal of 813240671 is 176042318.

813240671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176042318 = 2 ⋅88021159.

It is a cyclic number.

It is not a de Polignac number, because 813240671 - 2² = 813240667 is a prime.

It is a super-2 number, since 2×813240671² = 1322720777937060482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813246671) 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, 8651450 + ... + 8651543.

It is an arithmetic number, because the mean of its divisors is an integer number (207635928).

Almost surely, 2^813240671 is an apocalyptic number.

813240671 is a deficient number, since it is larger than the sum of its proper divisors (17303041).

813240671 is a wasteful number, since it uses less digits than its factorization.

813240671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17303040.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 813240671 is about 28517.3748967187. The cubic root of 813240671 is about 933.4112479881.

Adding to 813240671 its reverse (176042318), we get a palindrome (989282989).

The spelling of 813240671 in words is "eight hundred thirteen million, two hundred forty thousand, six hundred seventy-one".