31131203023 has 2 divisors, whose sum is σ = 31131203024. Its totient is φ = 31131203022.

The previous prime is 31131203021. The next prime is 31131203039. The reversal of 31131203023 is 32030213113.

It is a weak prime.

It is an emirp because it is prime and its reverse (32030213113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31131203023 - 2¹ = 31131203021 is a prime.

Together with 31131203021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31131203021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565601511 + 15565601512.

It is an arithmetic number, because the mean of its divisors is an integer number (15565601512).

Almost surely, 2^31131203023 is an apocalyptic number.

31131203023 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131203023 is an equidigital number, since it uses as much as digits as its factorization.

31131203023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31131203023 its reverse (32030213113), we get a palindrome (63161416136).

The spelling of 31131203023 in words is "thirty-one billion, one hundred thirty-one million, two hundred three thousand, twenty-three".