31223203201 has 4 divisors (see below), whose sum is σ = 31226124100. Its totient is φ = 31220282304.

The previous prime is 31223203183. The next prime is 31223203211. The reversal of 31223203201 is 10230232213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10230232213 = 4231 ⋅2417923.

It can be written as a sum of positive squares in 2 ways, for example, as 22722547600 + 8500655601 = 150740^2 + 92199^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223203201 - 2⁵ = 31223203169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223203211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444356 + ... + 1465813.

It is an arithmetic number, because the mean of its divisors is an integer number (7806531025).

Almost surely, 2^31223203201 is an apocalyptic number.

It is an amenable number.

31223203201 is a deficient number, since it is larger than the sum of its proper divisors (2920899).

31223203201 is a wasteful number, since it uses less digits than its factorization.

31223203201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920898.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31223203201 its reverse (10230232213), we get a palindrome (41453435414).

The spelling of 31223203201 in words is "thirty-one billion, two hundred twenty-three million, two hundred three thousand, two hundred one".