31130223 has 4 divisors (see below), whose sum is σ = 41506968. Its totient is φ = 20753480.

The previous prime is 31130221. The next prime is 31130233. The reversal of 31130223 is 32203113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32203113 = 3 ⋅10734371.

It is a cyclic number.

It is not a de Polignac number, because 31130223 - 2¹ = 31130221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130221) 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, 5188368 + ... + 5188373.

It is an arithmetic number, because the mean of its divisors is an integer number (10376742).

Almost surely, 2^31130223 is an apocalyptic number.

31130223 is a deficient number, since it is larger than the sum of its proper divisors (10376745).

31130223 is a wasteful number, since it uses less digits than its factorization.

31130223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10376744.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31130223 is about 5579.4464779223. The cubic root of 31130223 is about 314.5773217258.

Adding to 31130223 its reverse (32203113), we get a palindrome (63333336).

The spelling of 31130223 in words is "thirty-one million, one hundred thirty thousand, two hundred twenty-three".