817397710949 has 4 divisors (see below), whose sum is σ = 817970520864. Its totient is φ = 816824901036.

The previous prime is 817397710937. The next prime is 817397710951. The reversal of 817397710949 is 949017793718.

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: 949017793718 = 2 ⋅474508896859.

It is a cyclic number.

It is not a de Polignac number, because 817397710949 - 2⁴ = 817397710933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817397710919) 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, 286402817 + ... + 286405670.

It is an arithmetic number, because the mean of its divisors is an integer number (204492630216).

Almost surely, 2^817397710949 is an apocalyptic number.

It is an amenable number.

817397710949 is a deficient number, since it is larger than the sum of its proper divisors (572809915).

817397710949 is a wasteful number, since it uses less digits than its factorization.

817397710949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572809914.

The product of its (nonzero) digits is 24004512, while the sum is 65.

The spelling of 817397710949 in words is "eight hundred seventeen billion, three hundred ninety-seven million, seven hundred ten thousand, nine hundred forty-nine".