831666641 has 8 divisors (see below), whose sum is σ = 905705640. Its totient is φ = 759065472.

The previous prime is 831666631. The next prime is 831666653. The reversal of 831666641 is 146666138.

It can be written as a sum of positive squares in 4 ways, for example, as 101586241 + 730080400 = 10079^2 + 27020^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-831666641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (831666631) 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, 358250 + ... + 360563.

It is an arithmetic number, because the mean of its divisors is an integer number (113213205).

Almost surely, 2^831666641 is an apocalyptic number.

It is an amenable number.

831666641 is a deficient number, since it is larger than the sum of its proper divisors (74038999).

831666641 is a wasteful number, since it uses less digits than its factorization.

831666641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718915.

The product of its digits is 124416, while the sum is 41.

The square root of 831666641 is about 28838.6310528083. The cubic root of 831666641 is about 940.4082431507.

The spelling of 831666641 in words is "eight hundred thirty-one million, six hundred sixty-six thousand, six hundred forty-one".