831918649 has 3 divisors (see below), whose sum is σ = 831947493. Its totient is φ = 831889806.

The previous prime is 831918643. The next prime is 831918673. The reversal of 831918649 is 946819138.

The square root of 831918649 is 28843.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 831918649 - 2³ = 831918641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (831918641) 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 2 ways as a sum of consecutive naturals, for example, 14422 + ... + 43264.

It is an arithmetic number, because the mean of its divisors is an integer number (277315831).

Almost surely, 2^831918649 is an apocalyptic number.

831918649 is the 28843-rd square number.

831918649 is the 14422-nd centered octagonal number.

It is an amenable number.

831918649 is a deficient number, since it is larger than the sum of its proper divisors (28844).

831918649 is an frugal number, since it uses more digits than its factorization.

831918649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57686 (or 28843 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

The cubic root of 831918649 is about 940.5032196936.

Multiplying 831918649 by its sum of digits (49), we get a square (40764013801 = 201901²).

The spelling of 831918649 in words is "eight hundred thirty-one million, nine hundred eighteen thousand, six hundred forty-nine".