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30131223 = 310043741
BaseRepresentation
bin111001011110…
…0010000010111
32002200211021020
41302330100113
530203144343
62553452223
7514053063
oct162742027
962624236
1030131223
1116010041
12a111073
13631c935
144004aa3
1529a2b83
hex1cbc417

30131223 has 4 divisors (see below), whose sum is σ = 40174968. Its totient is φ = 20087480.

The previous prime is 30131201. The next prime is 30131243. The reversal of 30131223 is 32213103.

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 30131223 - 26 = 30131159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30131243) 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, 5021868 + ... + 5021873.

It is an arithmetic number, because the mean of its divisors is an integer number (10043742).

Almost surely, 230131223 is an apocalyptic number.

30131223 is a deficient number, since it is larger than the sum of its proper divisors (10043745).

30131223 is a wasteful number, since it uses less digits than its factorization.

30131223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043744.

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

The square root of 30131223 is about 5489.1914705173. The cubic root of 30131223 is about 311.1756364982.

Adding to 30131223 its reverse (32213103), we get a palindrome (62344326).

The spelling of 30131223 in words is "thirty million, one hundred thirty-one thousand, two hundred twenty-three".

Divisors: 1 3 10043741 30131223