31844940961 has 4 divisors (see below), whose sum is σ = 31845519252. Its totient is φ = 31844362672.

The previous prime is 31844940949. The next prime is 31844941027. The reversal of 31844940961 is 16904944813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16904944813 = 727 ⋅23253019.

It can be written as a sum of positive squares in 2 ways, for example, as 12570894400 + 19274046561 = 112120^2 + 138831^2 .

It is a cyclic number.

It is not a de Polignac number, because 31844940961 - 2¹¹ = 31844938913 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31844940931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196690 + ... + 319963.

It is an arithmetic number, because the mean of its divisors is an integer number (7961379813).

Almost surely, 2^31844940961 is an apocalyptic number.

It is an amenable number.

31844940961 is a deficient number, since it is larger than the sum of its proper divisors (578291).

31844940961 is an equidigital number, since it uses as much as digits as its factorization.

31844940961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578290.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 31844940961 in words is "thirty-one billion, eight hundred forty-four million, nine hundred forty thousand, nine hundred sixty-one".