31681077216 has 24 divisors (see below), whose sum is σ = 83162827944. Its totient is φ = 10560359040.

The previous prime is 31681077203. The next prime is 31681077271. The reversal of 31681077216 is 61277018613.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165005515 + ... + 165005706.

It is an arithmetic number, because the mean of its divisors is an integer number (3465117831).

Almost surely, 2^31681077216 is an apocalyptic number.

It is an amenable number.

31681077216 is an abundant number, since it is smaller than the sum of its proper divisors (51481750728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31681077216 is a wasteful number, since it uses less digits than its factorization.

31681077216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330011234 (or 330011226 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 31681077216 in words is "thirty-one billion, six hundred eighty-one million, seventy-seven thousand, two hundred sixteen".