31331020223 has 2 divisors, whose sum is σ = 31331020224. Its totient is φ = 31331020222.

The previous prime is 31331020177. The next prime is 31331020241. The reversal of 31331020223 is 32202013313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31331020223 - 2¹⁰ = 31331019199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31331020195 and 31331020204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31331020243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665510111 + 15665510112.

It is an arithmetic number, because the mean of its divisors is an integer number (15665510112).

Almost surely, 2^31331020223 is an apocalyptic number.

31331020223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331020223 is an equidigital number, since it uses as much as digits as its factorization.

31331020223 is an evil number, because the sum of its binary digits is even.

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

Adding to 31331020223 its reverse (32202013313), we get a palindrome (63533033536).

The spelling of 31331020223 in words is "thirty-one billion, three hundred thirty-one million, twenty thousand, two hundred twenty-three".