31211203013 has 8 divisors (see below), whose sum is σ = 31461744600. Its totient is φ = 30961658368.

The previous prime is 31211202959. The next prime is 31211203063. The reversal of 31211203013 is 31030211213.

It can be written as a sum of positive squares in 4 ways, for example, as 560647684 + 30650555329 = 23678^2 + 175073^2 .

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 31211203013 - 2¹² = 31211198917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31211202982 and 31211203000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211203063) 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, 186308 + ... + 311661.

It is an arithmetic number, because the mean of its divisors is an integer number (3932718075).

Almost surely, 2^31211203013 is an apocalyptic number.

It is an amenable number.

31211203013 is a deficient number, since it is larger than the sum of its proper divisors (250541587).

31211203013 is a wasteful number, since it uses less digits than its factorization.

31211203013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498471.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31211203013 its reverse (31030211213), we get a palindrome (62241414226).

The spelling of 31211203013 in words is "thirty-one billion, two hundred eleven million, two hundred three thousand, thirteen".