31131102223 has 4 divisors (see below), whose sum is σ = 33525802408. Its totient is φ = 28736402040.

The previous prime is 31131102199. The next prime is 31131102229. The reversal of 31131102223 is 32220113113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32220113113 = 19 ⋅1695795427.

It is a cyclic number.

It is not a de Polignac number, because 31131102223 - 2³³ = 22541167631 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 31131102223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131102229) 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, 1197350073 + ... + 1197350098.

It is an arithmetic number, because the mean of its divisors is an integer number (8381450602).

Almost surely, 2^31131102223 is an apocalyptic number.

31131102223 is a deficient number, since it is larger than the sum of its proper divisors (2394700185).

31131102223 is a wasteful number, since it uses less digits than its factorization.

31131102223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394700184.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31131102223 its reverse (32220113113), we get a palindrome (63351215336).

The spelling of 31131102223 in words is "thirty-one billion, one hundred thirty-one million, one hundred two thousand, two hundred twenty-three".