31848637897 has 4 divisors (see below), whose sum is σ = 32946866820. Its totient is φ = 30750408976.

The previous prime is 31848637853. The next prime is 31848637937. The reversal of 31848637897 is 79873684813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79873684813 = 13 ⋅6144129601.

It can be written as a sum of positive squares in 2 ways, for example, as 6549826761 + 25298811136 = 80931^2 + 159056^2 .

It is a cyclic number.

It is not a de Polignac number, because 31848637897 - 2²⁷ = 31714420169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31848637817) 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, 549114418 + ... + 549114475.

It is an arithmetic number, because the mean of its divisors is an integer number (8236716705).

Almost surely, 2^31848637897 is an apocalyptic number.

It is an amenable number.

31848637897 is a deficient number, since it is larger than the sum of its proper divisors (1098228923).

31848637897 is a wasteful number, since it uses less digits than its factorization.

31848637897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098228922.

The product of its digits is 48771072, while the sum is 64.

The spelling of 31848637897 in words is "thirty-one billion, eight hundred forty-eight million, six hundred thirty-seven thousand, eight hundred ninety-seven".