31539308849 has 4 divisors (see below), whose sum is σ = 31540730100. Its totient is φ = 31537887600.

The previous prime is 31539308819. The next prime is 31539308869. The reversal of 31539308849 is 94880393513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94880393513 = 173 ⋅548441581.

It can be written as a sum of positive squares in 2 ways, for example, as 27908041249 + 3631267600 = 167057^2 + 60260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31539308849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31539308849.

It is not an unprimeable number, because it can be changed into a prime (31539308819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676802 + ... + 721899.

It is an arithmetic number, because the mean of its divisors is an integer number (7885182525).

Almost surely, 2^31539308849 is an apocalyptic number.

It is an amenable number.

31539308849 is a deficient number, since it is larger than the sum of its proper divisors (1421251).

31539308849 is a wasteful number, since it uses less digits than its factorization.

31539308849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421250.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 31539308849 in words is "thirty-one billion, five hundred thirty-nine million, three hundred eight thousand, eight hundred forty-nine".