31003212013 has 4 divisors (see below), whose sum is σ = 31841136700. Its totient is φ = 30165287328.

The previous prime is 31003212007. The next prime is 31003212017. The reversal of 31003212013 is 31021230013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19936592809 + 11066619204 = 141197^2 + 105198^2 .

It is a cyclic number.

It is not a de Polignac number, because 31003212013 - 2¹³ = 31003203821 is a prime.

It is a super-3 number, since 3×31003212013³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003212017) 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, 418962288 + ... + 418962361.

It is an arithmetic number, because the mean of its divisors is an integer number (7960284175).

Almost surely, 2^31003212013 is an apocalyptic number.

It is an amenable number.

31003212013 is a deficient number, since it is larger than the sum of its proper divisors (837924687).

31003212013 is an equidigital number, since it uses as much as digits as its factorization.

31003212013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837924686.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31003212013 its reverse (31021230013), we get a palindrome (62024442026).

The spelling of 31003212013 in words is "thirty-one billion, three million, two hundred twelve thousand, thirteen".