31282028213 has 4 divisors (see below), whose sum is σ = 31283217888. Its totient is φ = 31280838540.

The previous prime is 31282028179. The next prime is 31282028249.

31282028213 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31282028213 - 2²⁶ = 31214919349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31282028213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31282028293) 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, 554483 + ... + 608288.

It is an arithmetic number, because the mean of its divisors is an integer number (7820804472).

Almost surely, 2^31282028213 is an apocalyptic number.

It is an amenable number.

31282028213 is a deficient number, since it is larger than the sum of its proper divisors (1189675).

31282028213 is a wasteful number, since it uses less digits than its factorization.

31282028213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189674.

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 31282028213 in words is "thirty-one billion, two hundred eighty-two million, twenty-eight thousand, two hundred thirteen".