31131100223 has 4 divisors (see below), whose sum is σ = 31140455040. Its totient is φ = 31121745408.

The previous prime is 31131100199. The next prime is 31131100237. The reversal of 31131100223 is 32200113113.

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 31131100223 - 2²⁶ = 31063991359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131100243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4672415 + ... + 4679072.

It is an arithmetic number, because the mean of its divisors is an integer number (7785113760).

Almost surely, 2^31131100223 is an apocalyptic number.

31131100223 is a deficient number, since it is larger than the sum of its proper divisors (9354817).

31131100223 is an equidigital number, since it uses as much as digits as its factorization.

31131100223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9354816.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31131100223 its reverse (32200113113), we get a palindrome (63331213336).

The spelling of 31131100223 in words is "thirty-one billion, one hundred thirty-one million, one hundred thousand, two hundred twenty-three".