831854099618161 has 9 divisors (see below), whose sum is σ = 833462797496121. Its totient is φ = 830248500944772.

The previous prime is 831854099618029. The next prime is 831854099618183. The reversal of 831854099618161 is 161816990458138.

The square root of 831854099618161 is 28841881.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 831854099618161 - 2¹⁹ = 831854099093873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (831854099618261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15084276190 + ... + 15084331336.

It is an arithmetic number, because the mean of its divisors is an integer number (92606977499569).

Almost surely, 2^{831854099618161} is an apocalyptic number.

831854099618161 is the 28841881-st square number.

831854099618161 is the 14420941-st centered octagonal number.

It is an amenable number.

831854099618161 is a deficient number, since it is larger than the sum of its proper divisors (1608697877960).

831854099618161 is an frugal number, since it uses more digits than its factorization.

831854099618161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111340 (or 55670 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 70.

The spelling of 831854099618161 in words is "eight hundred thirty-one trillion, eight hundred fifty-four billion, ninety-nine million, six hundred eighteen thousand, one hundred sixty-one".