31280808213 has 24 divisors (see below), whose sum is σ = 48846917600. Its totient is φ = 19222341984.

The previous prime is 31280808157. The next prime is 31280808233.

31280808213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31280808213 - 2⁶ = 31280808149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31280808233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2465683 + ... + 2478336.

Almost surely, 2^31280808213 is an apocalyptic number.

It is an amenable number.

31280808213 is a deficient number, since it is larger than the sum of its proper divisors (17566109387).

31280808213 is a wasteful number, since it uses less digits than its factorization.

31280808213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4944081 (or 4944078 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 31280808213 in words is "thirty-one billion, two hundred eighty million, eight hundred eight thousand, two hundred thirteen".