831232459921 has 4 divisors (see below), whose sum is σ = 831238659252. Its totient is φ = 831226260592.

The previous prime is 831232459909. The next prime is 831232459927. The reversal of 831232459921 is 129954232138.

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 623878819600 + 207353640321 = 789860^2 + 455361^2 .

It is a cyclic number.

It is not a de Polignac number, because 831232459921 - 2¹³ = 831232451729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (831232459927) 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, 2893990 + ... + 3168223.

It is an arithmetic number, because the mean of its divisors is an integer number (207809664813).

Almost surely, 2^831232459921 is an apocalyptic number.

It is an amenable number.

831232459921 is a deficient number, since it is larger than the sum of its proper divisors (6199331).

831232459921 is a wasteful number, since it uses less digits than its factorization.

831232459921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6199330.

The product of its digits is 933120, while the sum is 49.

The spelling of 831232459921 in words is "eight hundred thirty-one billion, two hundred thirty-two million, four hundred fifty-nine thousand, nine hundred twenty-one".