31130203 has 4 divisors (see below), whose sum is σ = 33524848. Its totient is φ = 28735560.

The previous prime is 31130171. The next prime is 31130221. The reversal of 31130203 is 30203113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30203113 = 61 ⋅495133.

It is a cyclic number.

It is not a de Polignac number, because 31130203 - 2⁵ = 31130171 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 2394631 = 31130203 / (3 + 1 + 1 + 3 + 0 + 2 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31130233) 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, 1197303 + ... + 1197328.

It is an arithmetic number, because the mean of its divisors is an integer number (8381212).

Almost surely, 2^31130203 is an apocalyptic number.

31130203 is a deficient number, since it is larger than the sum of its proper divisors (2394645).

31130203 is a wasteful number, since it uses less digits than its factorization.

31130203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394644.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 31130203 is about 5579.4446856296. Note that the first 3 decimals coincide. The cubic root of 31130203 is about 314.5772543577.

Adding to 31130203 its reverse (30203113), we get a palindrome (61333316).

The spelling of 31130203 in words is "thirty-one million, one hundred thirty thousand, two hundred three".