817145913 has 4 divisors (see below), whose sum is σ = 1089527888. Its totient is φ = 544763940.

The previous prime is 817145911. The next prime is 817145983. The reversal of 817145913 is 319541718.

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 817145913 - 2¹ = 817145911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817145911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136190983 + ... + 136190988.

It is an arithmetic number, because the mean of its divisors is an integer number (272381972).

Almost surely, 2^817145913 is an apocalyptic number.

It is an amenable number.

817145913 is a deficient number, since it is larger than the sum of its proper divisors (272381975).

817145913 is a wasteful number, since it uses less digits than its factorization.

817145913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272381974.

The product of its digits is 30240, while the sum is 39.

The square root of 817145913 is about 28585.7641668016. The cubic root of 817145913 is about 934.9029660900.

The spelling of 817145913 in words is "eight hundred seventeen million, one hundred forty-five thousand, nine hundred thirteen".