831331408561 has 8 divisors (see below), whose sum is σ = 841364695584. Its totient is φ = 821298532320.

The previous prime is 831331408543. The next prime is 831331408601. The reversal of 831331408561 is 165804133138.

831331408561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 831331408561 - 2⁵ = 831331408529 is a prime.

It is a super-2 number, since 2×831331408561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (831331408261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6561565 + ... + 6687061.

It is an arithmetic number, because the mean of its divisors is an integer number (105170586948).

Almost surely, 2^831331408561 is an apocalyptic number.

It is an amenable number.

831331408561 is a deficient number, since it is larger than the sum of its proper divisors (10033287023).

831331408561 is a wasteful number, since it uses less digits than its factorization.

831331408561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205391.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 831331408561 in words is "eight hundred thirty-one billion, three hundred thirty-one million, four hundred eight thousand, five hundred sixty-one".