20131033231 has 4 divisors (see below), whose sum is σ = 20135880072. Its totient is φ = 20126186392.

The previous prime is 20131033217. The next prime is 20131033243. The reversal of 20131033231 is 13233013102.

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 20131033231 - 2³¹ = 17983549583 is a prime.

It is a super-2 number, since 2×20131033231² (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 = 20131033199 and 20131033208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131033631) 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, 2417185 + ... + 2425498.

It is an arithmetic number, because the mean of its divisors is an integer number (5033970018).

Almost surely, 2^20131033231 is an apocalyptic number.

20131033231 is a deficient number, since it is larger than the sum of its proper divisors (4846841).

20131033231 is an equidigital number, since it uses as much as digits as its factorization.

20131033231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4846840.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20131033231 its reverse (13233013102), we get a palindrome (33364046333).

The spelling of 20131033231 in words is "twenty billion, one hundred thirty-one million, thirty-three thousand, two hundred thirty-one".