831325631 has 4 divisors (see below), whose sum is σ = 831385632. Its totient is φ = 831265632.

The previous prime is 831325609. The next prime is 831325633. The reversal of 831325631 is 136523138.

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, and also an emirpimes, since its reverse is a distinct semiprime: 136523138 = 2 ⋅68261569.

It is a cyclic number.

It is not a de Polignac number, because 831325631 - 2⁶ = 831325567 is a prime.

It is a super-2 number, since 2×831325631² = 1382204609515096322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831325633) 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, 2570 + ... + 40856.

It is an arithmetic number, because the mean of its divisors is an integer number (207846408).

Almost surely, 2^831325631 is an apocalyptic number.

831325631 is a deficient number, since it is larger than the sum of its proper divisors (60001).

831325631 is a wasteful number, since it uses less digits than its factorization.

831325631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60000.

The product of its digits is 12960, while the sum is 32.

The square root of 831325631 is about 28832.7180647264. The cubic root of 831325631 is about 940.2796930642.

Adding to 831325631 its reverse (136523138), we get a palindrome (967848769).

The spelling of 831325631 in words is "eight hundred thirty-one million, three hundred twenty-five thousand, six hundred thirty-one".