31203203223 has 4 divisors (see below), whose sum is σ = 41604270968. Its totient is φ = 20802135480.

The previous prime is 31203203219. The next prime is 31203203243. The reversal of 31203203223 is 32230230213.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31203203223 - 2² = 31203203219 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 31203203223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203203243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5200533868 + ... + 5200533873.

It is an arithmetic number, because the mean of its divisors is an integer number (10401067742).

Almost surely, 2^31203203223 is an apocalyptic number.

31203203223 is a deficient number, since it is larger than the sum of its proper divisors (10401067745).

31203203223 is a wasteful number, since it uses less digits than its factorization.

31203203223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401067744.

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 31203203223 its reverse (32230230213), we get a palindrome (63433433436).

The spelling of 31203203223 in words is "thirty-one billion, two hundred three million, two hundred three thousand, two hundred twenty-three".