31013131103 has 4 divisors (see below), whose sum is σ = 31014132528. Its totient is φ = 31012129680.

The previous prime is 31013131099. The next prime is 31013131109. The reversal of 31013131103 is 30113131013.

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 31013131103 - 2² = 31013131099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013131109) 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, 452726 + ... + 516707.

It is an arithmetic number, because the mean of its divisors is an integer number (7753533132).

Almost surely, 2^31013131103 is an apocalyptic number.

31013131103 is a deficient number, since it is larger than the sum of its proper divisors (1001425).

31013131103 is an equidigital number, since it uses as much as digits as its factorization.

31013131103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001424.

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

Adding to 31013131103 its reverse (30113131013), we get a palindrome (61126262116).

The spelling of 31013131103 in words is "thirty-one billion, thirteen million, one hundred thirty-one thousand, one hundred three".