20130331031 has 4 divisors (see below), whose sum is σ = 20130746064. Its totient is φ = 20129916000.

The previous prime is 20130330977. The next prime is 20130331049. The reversal of 20130331031 is 13013303102.

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-20130331031 is a prime.

It is a super-2 number, since 2×20130331031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130331061) 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, 123395 + ... + 235556.

It is an arithmetic number, because the mean of its divisors is an integer number (5032686516).

Almost surely, 2^20130331031 is an apocalyptic number.

20130331031 is a deficient number, since it is larger than the sum of its proper divisors (415033).

20130331031 is an equidigital number, since it uses as much as digits as its factorization.

20130331031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415032.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 20130331031 its reverse (13013303102), we get a palindrome (33143634133).

The spelling of 20130331031 in words is "twenty billion, one hundred thirty million, three hundred thirty-one thousand, thirty-one".