31020103 has 4 divisors (see below), whose sum is σ = 32652760. Its totient is φ = 29387448.

The previous prime is 31020091. The next prime is 31020107. The reversal of 31020103 is 30102013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30102013 = 709 ⋅42457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31020103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816300 + ... + 816337.

It is an arithmetic number, because the mean of its divisors is an integer number (8163190).

Almost surely, 2^31020103 is an apocalyptic number.

31020103 is a deficient number, since it is larger than the sum of its proper divisors (1632657).

31020103 is a wasteful number, since it uses less digits than its factorization.

31020103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632656.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 31020103 is about 5569.5693729408. The cubic root of 31020103 is about 314.2059550556.

Adding to 31020103 its reverse (30102013), we get a palindrome (61122116).

It can be divided in two parts, 3102010 and 3, that added together give a palindrome (3102013).

The spelling of 31020103 in words is "thirty-one million, twenty thousand, one hundred three".