31113101013131 has 4 divisors (see below), whose sum is σ = 31113131793192. Its totient is φ = 31113070233072.

The previous prime is 31113101013109. The next prime is 31113101013151. The reversal of 31113101013131 is 13131010131113.

It is a happy number.

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-31113101013131 is a prime.

It is a super-2 number, since 2×31113101013131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31113101013101) 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, 13820441 + ... + 15913226.

It is an arithmetic number, because the mean of its divisors is an integer number (7778282948298).

Almost surely, 2^{31113101013131} is an apocalyptic number.

31113101013131 is a deficient number, since it is larger than the sum of its proper divisors (30780061).

31113101013131 is a wasteful number, since it uses less digits than its factorization.

31113101013131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30780060.

The product of its (nonzero) digits is 81, while the sum is 20.

Adding to 31113101013131 its reverse (13131010131113), we get a palindrome (44244111144244).

The spelling of 31113101013131 in words is "thirty-one trillion, one hundred thirteen billion, one hundred one million, thirteen thousand, one hundred thirty-one".