831649 has 24 divisors (see below), whose sum is σ = 1112640. Its totient is φ = 606528.

The previous prime is 831647. The next prime is 831653. The reversal of 831649 is 946138.

It is not a de Polignac number, because 831649 - 2¹ = 831647 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 831649.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22459 + ... + 22495.

It is an arithmetic number, because the mean of its divisors is an integer number (46360).

2⁸³¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

831649 is a deficient number, since it is larger than the sum of its proper divisors (280991).

831649 is a wasteful number, since it uses less digits than its factorization.

831649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 76 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 831649 is about 911.9479151794. The cubic root of 831649 is about 94.0401593908.

It can be divided in two parts, 83164 and 9, that multiplied together give a triangular number (748476 = T₁₂₂₃).

The spelling of 831649 in words is "eight hundred thirty-one thousand, six hundred forty-nine".