31231201123 has 2 divisors, whose sum is σ = 31231201124. Its totient is φ = 31231201122.

The previous prime is 31231201121. The next prime is 31231201163. The reversal of 31231201123 is 32110213213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31231201123 - 2¹ = 31231201121 is a prime.

It is a super-2 number, since 2×31231201123² (a number of 22 digits) contains 22 as substring.

Together with 31231201121, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31231201123.

It is not a weakly prime, because it can be changed into another prime (31231201121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615600561 + 15615600562.

It is an arithmetic number, because the mean of its divisors is an integer number (15615600562).

Almost surely, 2^31231201123 is an apocalyptic number.

31231201123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231201123 is an equidigital number, since it uses as much as digits as its factorization.

31231201123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31231201123 its reverse (32110213213), we get a palindrome (63341414336).

The spelling of 31231201123 in words is "thirty-one billion, two hundred thirty-one million, two hundred one thousand, one hundred twenty-three".