31131032223 has 16 divisors (see below), whose sum is σ = 41567926400. Its totient is φ = 20724107040.

The previous prime is 31131032183. The next prime is 31131032227. The reversal of 31131032223 is 32223013113.

It is not a de Polignac number, because 31131032223 - 2⁶ = 31131032159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31131032223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131032227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11397768 + ... + 11400498.

It is an arithmetic number, because the mean of its divisors is an integer number (2597995400).

Almost surely, 2^31131032223 is an apocalyptic number.

31131032223 is a deficient number, since it is larger than the sum of its proper divisors (10436894177).

31131032223 is a wasteful number, since it uses less digits than its factorization.

31131032223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31131032223 its reverse (32223013113), we get a palindrome (63354045336).

The spelling of 31131032223 in words is "thirty-one billion, one hundred thirty-one million, thirty-two thousand, two hundred twenty-three".