31000120103 has 4 divisors (see below), whose sum is σ = 31008111648. Its totient is φ = 30992128560.

The previous prime is 31000120069. The next prime is 31000120127. The reversal of 31000120103 is 30102100013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31000120103 - 2⁸ = 31000119847 is a prime.

It is a super-2 number, since 2×31000120103² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000120003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3989951 + ... + 3997712.

It is an arithmetic number, because the mean of its divisors is an integer number (7752027912).

Almost surely, 2^31000120103 is an apocalyptic number.

31000120103 is a deficient number, since it is larger than the sum of its proper divisors (7991545).

31000120103 is an equidigital number, since it uses as much as digits as its factorization.

31000120103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7991544.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 31000120103 its reverse (30102100013), we get a palindrome (61102220116).

The spelling of 31000120103 in words is "thirty-one billion, one hundred twenty thousand, one hundred three".