31131130103 has 2 divisors, whose sum is σ = 31131130104. Its totient is φ = 31131130102.

The previous prime is 31131130073. The next prime is 31131130123. The reversal of 31131130103 is 30103113113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31131130103 - 2⁸ = 31131129847 is a prime.

It is a super-2 number, since 2×31131130103² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31131130123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565565051 + 15565565052.

It is an arithmetic number, because the mean of its divisors is an integer number (15565565052).

Almost surely, 2^31131130103 is an apocalyptic number.

31131130103 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131130103 is an equidigital number, since it uses as much as digits as its factorization.

31131130103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 17.

Adding to 31131130103 its reverse (30103113113), we get a palindrome (61234243216).

The spelling of 31131130103 in words is "thirty-one billion, one hundred thirty-one million, one hundred thirty thousand, one hundred three".