31712447117 has 4 divisors (see below), whose sum is σ = 34151866140. Its totient is φ = 29273028096.

The previous prime is 31712447101. The next prime is 31712447147. The reversal of 31712447117 is 71174421713.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9278698276 + 22433748841 = 96326^2 + 149779^2 .

It is not a de Polignac number, because 31712447117 - 2⁴ = 31712447101 is a prime.

It is a super-2 number, since 2×31712447117² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31712447147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219709492 + ... + 1219709517.

It is an arithmetic number, because the mean of its divisors is an integer number (8537966535).

Almost surely, 2^31712447117 is an apocalyptic number.

It is an amenable number.

31712447117 is a deficient number, since it is larger than the sum of its proper divisors (2439419023).

31712447117 is a wasteful number, since it uses less digits than its factorization.

31712447117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439419022.

The product of its digits is 32928, while the sum is 38.

The spelling of 31712447117 in words is "thirty-one billion, seven hundred twelve million, four hundred forty-seven thousand, one hundred seventeen".