31712681551 has 4 divisors (see below), whose sum is σ = 31729853232. Its totient is φ = 31695509872.

The previous prime is 31712681549. The next prime is 31712681579. The reversal of 31712681551 is 15518621713.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31712681551 - 2¹ = 31712681549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31712681521) by changing a digit.

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, 8583070 + ... + 8586763.

It is an arithmetic number, because the mean of its divisors is an integer number (7932463308).

Almost surely, 2^31712681551 is an apocalyptic number.

31712681551 is a deficient number, since it is larger than the sum of its proper divisors (17171681).

31712681551 is a wasteful number, since it uses less digits than its factorization.

31712681551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17171680.

The product of its digits is 50400, while the sum is 40.

The spelling of 31712681551 in words is "thirty-one billion, seven hundred twelve million, six hundred eighty-one thousand, five hundred fifty-one".