913573856809 has 4 divisors (see below), whose sum is σ = 914155382160. Its totient is φ = 912992331460.

The previous prime is 913573856807. The next prime is 913573856813. The reversal of 913573856809 is 908658375319.

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, and also an emirpimes, since its reverse is a distinct semiprime: 908658375319 = 34511 ⋅26329529.

It is a cyclic number.

It is not a de Polignac number, because 913573856809 - 2¹ = 913573856807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (913573856801) 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, 290760319 + ... + 290763460.

It is an arithmetic number, because the mean of its divisors is an integer number (228538845540).

Almost surely, 2^913573856809 is an apocalyptic number.

It is an amenable number.

913573856809 is a deficient number, since it is larger than the sum of its proper divisors (581525351).

913573856809 is a wasteful number, since it uses less digits than its factorization.

913573856809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581525350.

The product of its (nonzero) digits is 48988800, while the sum is 64.

The spelling of 913573856809 in words is "nine hundred thirteen billion, five hundred seventy-three million, eight hundred fifty-six thousand, eight hundred nine".