31313122020203 has 4 divisors (see below), whose sum is σ = 31313207648688. Its totient is φ = 31313036391720.

The previous prime is 31313122020151. The next prime is 31313122020253. The reversal of 31313122020203 is 30202022131313.

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 31313122020203 - 2¹⁸ = 31313121758059 is a prime.

It is a super-2 number, since 2×31313122020203² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313122020253) 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, 42263351 + ... + 42997872.

It is an arithmetic number, because the mean of its divisors is an integer number (7828301912172).

Almost surely, 2^{31313122020203} is an apocalyptic number.

31313122020203 is a deficient number, since it is larger than the sum of its proper divisors (85628485).

31313122020203 is an equidigital number, since it uses as much as digits as its factorization.

31313122020203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85628484.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31313122020203 its reverse (30202022131313), we get a palindrome (61515144151516).

It can be divided in two parts, 3131312 and 2020203, that added together give a palindrome (5151515).

The spelling of 31313122020203 in words is "thirty-one trillion, three hundred thirteen billion, one hundred twenty-two million, twenty thousand, two hundred three".