834553821 has 8 divisors (see below), whose sum is σ = 1148633344. Its totient is φ = 538421760.

The previous prime is 834553799. The next prime is 834553829. The reversal of 834553821 is 128355438.

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

It is not a de Polignac number, because 834553821 - 2⁶ = 834553757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 834553821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (834553829) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4486756 + ... + 4486941.

It is an arithmetic number, because the mean of its divisors is an integer number (143579168).

Almost surely, 2^834553821 is an apocalyptic number.

It is an amenable number.

834553821 is a deficient number, since it is larger than the sum of its proper divisors (314079523).

834553821 is a wasteful number, since it uses less digits than its factorization.

834553821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8973731.

The product of its digits is 115200, while the sum is 39.

The square root of 834553821 is about 28888.6451914935. The cubic root of 834553821 is about 941.4952139289.

The spelling of 834553821 in words is "eight hundred thirty-four million, five hundred fifty-three thousand, eight hundred twenty-one".