819874289 has 4 divisors (see below), whose sum is σ = 882941556. Its totient is φ = 756807024.

The previous prime is 819874271. The next prime is 819874291. The reversal of 819874289 is 982478918.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118048225 + 701826064 = 10865^2 + 26492^2 .

It is a cyclic number.

It is not a de Polignac number, because 819874289 - 2¹² = 819870193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819874219) 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, 31533614 + ... + 31533639.

It is an arithmetic number, because the mean of its divisors is an integer number (220735389).

Almost surely, 2^819874289 is an apocalyptic number.

It is an amenable number.

819874289 is a deficient number, since it is larger than the sum of its proper divisors (63067267).

819874289 is a wasteful number, since it uses less digits than its factorization.

819874289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63067266.

The product of its digits is 2322432, while the sum is 56.

The square root of 819874289 is about 28633.4470331464. The cubic root of 819874289 is about 935.9423288699.

The spelling of 819874289 in words is "eight hundred nineteen million, eight hundred seventy-four thousand, two hundred eighty-nine".