817819054 has 12 divisors (see below), whose sum is σ = 1328351616. Its totient is φ = 377454792.

The previous prime is 817819039. The next prime is 817819061. The reversal of 817819054 is 450918718.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 817819054.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1209454 + ... + 1210129.

It is an arithmetic number, because the mean of its divisors is an integer number (110695968).

Almost surely, 2^817819054 is an apocalyptic number.

817819054 is a deficient number, since it is larger than the sum of its proper divisors (510532562).

817819054 is a wasteful number, since it uses less digits than its factorization.

817819054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419611 (or 2419598 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 817819054 is about 28597.5358029324. The cubic root of 817819054 is about 935.1596109075.

The spelling of 817819054 in words is "eight hundred seventeen million, eight hundred nineteen thousand, fifty-four".