31311330003131 has 4 divisors (see below), whose sum is σ = 31536591370200. Its totient is φ = 31086068636064.

The previous prime is 31311330003077. The next prime is 31311330003179. The reversal of 31311330003131 is 13130003311313.

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

It is a cyclic number.

It is not a de Polignac number, because 31311330003131 - 2¹⁴ = 31311329986747 is a prime.

It is a super-2 number, since 2×31311330003131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31311330003097 and 31311330003106.

It is not an unprimeable number, because it can be changed into a prime (31311330033131) 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, 112630683326 + ... + 112630683603.

It is an arithmetic number, because the mean of its divisors is an integer number (7884147842550).

Almost surely, 2^{31311330003131} is an apocalyptic number.

31311330003131 is a deficient number, since it is larger than the sum of its proper divisors (225261367069).

31311330003131 is a wasteful number, since it uses less digits than its factorization.

31311330003131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225261367068.

The product of its (nonzero) digits is 729, while the sum is 23.

Adding to 31311330003131 its reverse (13130003311313), we get a palindrome (44441333314444).

The spelling of 31311330003131 in words is "thirty-one trillion, three hundred eleven billion, three hundred thirty million, three thousand, one hundred thirty-one".