817947051 has 8 divisors (see below), whose sum is σ = 1105956864. Its totient is φ = 537617640.

The previous prime is 817947047. The next prime is 817947071. The reversal of 817947051 is 150749718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 817947051 - 2² = 817947047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 817946994 and 817947012.

It is not an unprimeable number, because it can be changed into a prime (817947041) 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 7 ways as a sum of consecutive naturals, for example, 1919851 + ... + 1920276.

It is an arithmetic number, because the mean of its divisors is an integer number (138244608).

Almost surely, 2^817947051 is an apocalyptic number.

817947051 is a deficient number, since it is larger than the sum of its proper divisors (288009813).

817947051 is a wasteful number, since it uses less digits than its factorization.

817947051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840201.

The product of its (nonzero) digits is 70560, while the sum is 42.

The square root of 817947051 is about 28599.7736179852. The cubic root of 817947051 is about 935.2083956927.

The spelling of 817947051 in words is "eight hundred seventeen million, nine hundred forty-seven thousand, fifty-one".