31996806161 has 8 divisors (see below), whose sum is σ = 32317460904. Its totient is φ = 31676227200.

The previous prime is 31996806143. The next prime is 31996806167. The reversal of 31996806161 is 16160869913.

It can be written as a sum of positive squares in 4 ways, for example, as 27715590400 + 4281215761 = 166480^2 + 65431^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31996806161 - 2¹⁴ = 31996789777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31996806167) 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, 1255235 + ... + 1280471.

It is an arithmetic number, because the mean of its divisors is an integer number (4039682613).

Almost surely, 2^31996806161 is an apocalyptic number.

It is an amenable number.

31996806161 is a deficient number, since it is larger than the sum of its proper divisors (320654743).

31996806161 is a wasteful number, since it uses less digits than its factorization.

31996806161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37891.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 31996806161 in words is "thirty-one billion, nine hundred ninety-six million, eight hundred six thousand, one hundred sixty-one".