31311201020131 has 4 divisors (see below), whose sum is σ = 31315971893832. Its totient is φ = 31306430146432.

The previous prime is 31311201020107. The next prime is 31311201020173. The reversal of 31311201020131 is 13102010211313.

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 31311201020131 - 2¹³ = 31311201011939 is a prime.

It is a super-2 number, since 2×31311201020131² (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 = 31311201020099 and 31311201020108.

It is not an unprimeable number, because it can be changed into a prime (31311201023131) 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, 2385427006 + ... + 2385440131.

It is an arithmetic number, because the mean of its divisors is an integer number (7828992973458).

Almost surely, 2^{31311201020131} is an apocalyptic number.

31311201020131 is a deficient number, since it is larger than the sum of its proper divisors (4770873701).

31311201020131 is an equidigital number, since it uses as much as digits as its factorization.

31311201020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770873700.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 31311201020131 its reverse (13102010211313), we get a palindrome (44413211231444).

The spelling of 31311201020131 in words is "thirty-one trillion, three hundred eleven billion, two hundred one million, twenty thousand, one hundred thirty-one".