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145231 = 178543
BaseRepresentation
bin100011011101001111
321101012221
4203131033
514121411
63040211
71143262
oct433517
9241187
10145231
119a129
1270067
1351148
143acd9
152d071
hex2374f

145231 has 4 divisors (see below), whose sum is σ = 153792. Its totient is φ = 136672.

The previous prime is 145219. The next prime is 145253. The reversal of 145231 is 132541.

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 145231 - 29 = 144719 is a prime.

It is a super-2 number, since 2×1452312 = 42184086722, which contains 22 as substring.

It is a Duffinian number.

145231 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4255 + ... + 4288.

It is an arithmetic number, because the mean of its divisors is an integer number (38448).

2145231 is an apocalyptic number.

145231 is a deficient number, since it is larger than the sum of its proper divisors (8561).

145231 is an equidigital number, since it uses as much as digits as its factorization.

145231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8560.

The product of its digits is 120, while the sum is 16.

The square root of 145231 is about 381.0918524451. The cubic root of 145231 is about 52.5637622862.

Adding to 145231 its reverse (132541), we get a palindrome (277772).

The spelling of 145231 in words is "one hundred forty-five thousand, two hundred thirty-one".

Divisors: 1 17 8543 145231