31031100103 has 2 divisors, whose sum is σ = 31031100104. Its totient is φ = 31031100102.

The previous prime is 31031100077. The next prime is 31031100109. The reversal of 31031100103 is 30100113013.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031100103 is a prime.

It is a super-2 number, since 2×31031100103² (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 (31031100109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515550051 + 15515550052.

It is an arithmetic number, because the mean of its divisors is an integer number (15515550052).

Almost surely, 2^31031100103 is an apocalyptic number.

31031100103 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031100103 is an equidigital number, since it uses as much as digits as its factorization.

31031100103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27, while the sum is 13.

Adding to 31031100103 its reverse (30100113013), we get a palindrome (61131213116).

The spelling of 31031100103 in words is "thirty-one billion, thirty-one million, one hundred thousand, one hundred three".