817242747 has 4 divisors (see below), whose sum is σ = 1089657000. Its totient is φ = 544828496.

The previous prime is 817242743. The next prime is 817242749. The reversal of 817242747 is 747242718.

817242747 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.

It is a cyclic number.

It is not a de Polignac number, because 817242747 - 2² = 817242743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 817242699 and 817242708.

It is not an unprimeable number, because it can be changed into a prime (817242743) 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, 136207122 + ... + 136207127.

It is an arithmetic number, because the mean of its divisors is an integer number (272414250).

Almost surely, 2^817242747 is an apocalyptic number.

817242747 is a deficient number, since it is larger than the sum of its proper divisors (272414253).

817242747 is a wasteful number, since it uses less digits than its factorization.

817242747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272414252.

The product of its digits is 175616, while the sum is 42.

The square root of 817242747 is about 28587.4578617967. The cubic root of 817242747 is about 934.9398941411.

The spelling of 817242747 in words is "eight hundred seventeen million, two hundred forty-two thousand, seven hundred forty-seven".