831720413 has 4 divisors (see below), whose sum is σ = 849416640. Its totient is φ = 814024188.

The previous prime is 831720403. The next prime is 831720419. The reversal of 831720413 is 314027138.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 831720413 - 2¹⁰ = 831719389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831720419) 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, 8848043 + ... + 8848136.

It is an arithmetic number, because the mean of its divisors is an integer number (212354160).

Almost surely, 2^831720413 is an apocalyptic number.

It is an amenable number.

831720413 is a deficient number, since it is larger than the sum of its proper divisors (17696227).

831720413 is a wasteful number, since it uses less digits than its factorization.

831720413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17696226.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 831720413 is about 28839.5633288717. The cubic root of 831720413 is about 940.4285103025.

The spelling of 831720413 in words is "eight hundred thirty-one million, seven hundred twenty thousand, four hundred thirteen".