31203113103 has 12 divisors (see below), whose sum is σ = 45178737240. Its totient is φ = 20752425936.

The previous prime is 31203113101. The next prime is 31203113111. The reversal of 31203113103 is 30131130213.

It is a happy number.

It is not a de Polignac number, because 31203113103 - 2¹ = 31203113101 is a prime.

It is a super-2 number, since 2×31203113103² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203113101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4133476 + ... + 4141017.

It is an arithmetic number, because the mean of its divisors is an integer number (3764894770).

Almost surely, 2^31203113103 is an apocalyptic number.

31203113103 is a deficient number, since it is larger than the sum of its proper divisors (13975624137).

31203113103 is a wasteful number, since it uses less digits than its factorization.

31203113103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8274918 (or 8274915 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31203113103 its reverse (30131130213), we get a palindrome (61334243316).

The spelling of 31203113103 in words is "thirty-one billion, two hundred three million, one hundred thirteen thousand, one hundred three".