31994646077161 has 2 divisors, whose sum is σ = 31994646077162. Its totient is φ = 31994646077160.

The previous prime is 31994646077101. The next prime is 31994646077171. The reversal of 31994646077161 is 16177064649913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31994465013225 + 181063936 = 5656365^2 + 13456^2 .

It is an emirp because it is prime and its reverse (16177064649913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31994646077161 - 2¹⁷ = 31994645946089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31994646077093 and 31994646077102.

It is not a weakly prime, because it can be changed into another prime (31994646077101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15997323038580 + 15997323038581.

It is an arithmetic number, because the mean of its divisors is an integer number (15997323038581).

Almost surely, 2^{31994646077161} is an apocalyptic number.

It is an amenable number.

31994646077161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31994646077161 is an equidigital number, since it uses as much as digits as its factorization.

31994646077161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41150592, while the sum is 64.

The spelling of 31994646077161 in words is "thirty-one trillion, nine hundred ninety-four billion, six hundred forty-six million, seventy-seven thousand, one hundred sixty-one".