31131330213 has 8 divisors (see below), whose sum is σ = 41639383008.
Its totient is φ = 20688748784.
The previous prime is 31131330133. The next prime is 31131330221. The reversal of 31131330213 is 31203313113.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 31131330213 - 29 = 31131329701 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 31131330213.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31131330233) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16366731 + ... + 16368632.
It is an arithmetic number, because the mean of its divisors is an integer number (5204922876).
Almost surely, 231131330213 is an apocalyptic number.
It is an amenable number.
31131330213 is a deficient number, since it is larger than the sum of its proper divisors (10508052795).
31131330213 is a wasteful number, since it uses less digits than its factorization.
31131330213 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 32735683.
The product of its (nonzero) digits is 486, while the sum is 21.
Adding to 31131330213 its reverse (31203313113), we get a palindrome (62334643326).
The spelling of 31131330213 in words is "thirty-one billion, one hundred thirty-one million, three hundred thirty thousand, two hundred thirteen".