31347747617 has 4 divisors (see below), whose sum is σ = 31351498116. Its totient is φ = 31343997120.

The previous prime is 31347747611. The next prime is 31347747619. The reversal of 31347747617 is 71674774313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71674774313 = 317 ⋅226103389.

It can be written as a sum of positive squares in 2 ways, for example, as 10599937936 + 20747809681 = 102956^2 + 144041^2 .

It is a cyclic number.

It is not a de Polignac number, because 31347747617 - 2¹⁰ = 31347746593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31347747611) 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, 1862684 + ... + 1879437.

It is an arithmetic number, because the mean of its divisors is an integer number (7837874529).

Almost surely, 2^31347747617 is an apocalyptic number.

It is an amenable number.

31347747617 is a deficient number, since it is larger than the sum of its proper divisors (3750499).

31347747617 is an equidigital number, since it uses as much as digits as its factorization.

31347747617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750498.

The product of its digits is 2074464, while the sum is 50.

The spelling of 31347747617 in words is "thirty-one billion, three hundred forty-seven million, seven hundred forty-seven thousand, six hundred seventeen".