Search a number
130231 = 314201
BaseRepresentation
bin11111110010110111
320121122101
4133302313
513131411
62442531
71051453
oct376267
9217571
10130231
1189932
1263447
134737a
1435663
15288c1
hex1fcb7

130231 has 4 divisors (see below), whose sum is σ = 134464. Its totient is φ = 126000.

The previous prime is 130223. The next prime is 130241. The reversal of 130231 is 132031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132031 = 196949.

It is a cyclic number.

It is not a de Polignac number, because 130231 - 23 = 130223 is a prime.

It is a super-2 number, since 2×1302312 = 33920226722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130201) 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, 2070 + ... + 2131.

It is an arithmetic number, because the mean of its divisors is an integer number (33616).

2130231 is an apocalyptic number.

130231 is a deficient number, since it is larger than the sum of its proper divisors (4233).

130231 is an equidigital number, since it uses as much as digits as its factorization.

130231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4232.

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

The square root of 130231 is about 360.8753247314. The cubic root of 130231 is about 50.6879575417.

Adding to 130231 its reverse (132031), we get a palindrome (262262).

It can be divided in two parts, 130 and 231, that added together give a square (361 = 192).

The spelling of 130231 in words is "one hundred thirty thousand, two hundred thirty-one".

Divisors: 1 31 4201 130231