31313201131 has 4 divisors (see below), whose sum is σ = 31323902112. Its totient is φ = 31302500152.

The previous prime is 31313201113. The next prime is 31313201141. The reversal of 31313201131 is 13110231313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313201131 is a prime.

It is a super-2 number, since 2×31313201131² (a number of 22 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 = 31313201099 and 31313201108.

It is not an unprimeable number, because it can be changed into a prime (31313201111) 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, 5346100 + ... + 5351953.

It is an arithmetic number, because the mean of its divisors is an integer number (7830975528).

Almost surely, 2^31313201131 is an apocalyptic number.

31313201131 is a deficient number, since it is larger than the sum of its proper divisors (10700981).

31313201131 is a wasteful number, since it uses less digits than its factorization.

31313201131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700980.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31313201131 its reverse (13110231313), we get a palindrome (44423432444).

The spelling of 31313201131 in words is "thirty-one billion, three hundred thirteen million, two hundred one thousand, one hundred thirty-one".