31994646017161 has 3 divisors (see below), whose sum is σ = 31994651673543. Its totient is φ = 31994640360780.

The previous prime is 31994646017129. The next prime is 31994646017267. The reversal of 31994646017161 is 16171064649913.

The square root of 31994646017161 is 5656381.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 25065853309561 + 6928792707600 = 5006581^2 + 2632260^2 .

It is not a de Polignac number, because 31994646017161 - 2⁵ = 31994646017129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31994646017096 and 31994646017105.

It is not an unprimeable number, because it can be changed into a prime (31994646077161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2828191 + ... + 8484571.

It is an arithmetic number, because the mean of its divisors is an integer number (10664883891181).

Almost surely, 2^{31994646017161} is an apocalyptic number.

31994646017161 is the 5656381-st square number.

31994646017161 is the 2828191-st centered octagonal number.

It is an amenable number.

31994646017161 is a deficient number, since it is larger than the sum of its proper divisors (5656382).

31994646017161 is an frugal number, since it uses more digits than its factorization.

31994646017161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11312762 (or 5656381 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 31994646017161 in words is "thirty-one trillion, nine hundred ninety-four billion, six hundred forty-six million, seventeen thousand, one hundred sixty-one".