20131243131 has 8 divisors (see below), whose sum is σ = 26856924160. Its totient is φ = 13413195432.

The previous prime is 20131243123. The next prime is 20131243151. The reversal of 20131243131 is 13134213102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20131243131 - 2³ = 20131243123 is a prime.

It is a super-2 number, since 2×20131243131² (a number of 21 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 = 20131243098 and 20131243107.

It is not an unprimeable number, because it can be changed into a prime (20131243151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1902175 + ... + 1912728.

It is an arithmetic number, because the mean of its divisors is an integer number (3357115520).

Almost surely, 2^20131243131 is an apocalyptic number.

20131243131 is a deficient number, since it is larger than the sum of its proper divisors (6725681029).

20131243131 is a wasteful number, since it uses less digits than its factorization.

20131243131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3816665.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20131243131 its reverse (13134213102), we get a palindrome (33265456233).

The spelling of 20131243131 in words is "twenty billion, one hundred thirty-one million, two hundred forty-three thousand, one hundred thirty-one".