31231023203 has 4 divisors (see below), whose sum is σ = 31244986560. Its totient is φ = 31217059848.

The previous prime is 31231023149. The next prime is 31231023209. The reversal of 31231023203 is 30232013213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30232013213 = 71 ⋅425803003.

It is a cyclic number.

It is not a de Polignac number, because 31231023203 - 2⁶ = 31231023139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231023209) 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, 6978323 + ... + 6982796.

It is an arithmetic number, because the mean of its divisors is an integer number (7811246640).

Almost surely, 2^31231023203 is an apocalyptic number.

31231023203 is a deficient number, since it is larger than the sum of its proper divisors (13963357).

31231023203 is a wasteful number, since it uses less digits than its factorization.

31231023203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13963356.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31231023203 its reverse (30232013213), we get a palindrome (61463036416).

The spelling of 31231023203 in words is "thirty-one billion, two hundred thirty-one million, twenty-three thousand, two hundred three".