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145239205 = 529047841
BaseRepresentation
bin10001010100000…
…10110010100101
3101010021220201211
420222002302211
5244140123310
622224551421
73412340626
oct1052026245
9333256654
10145239205
1174a90401
1240782571
1324122c77
1415409a4d
15cb3dc8a
hex8a82ca5

145239205 has 4 divisors (see below), whose sum is σ = 174287052. Its totient is φ = 116191360.

The previous prime is 145239197. The next prime is 145239223. The reversal of 145239205 is 502932541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502932541 = 1792809679.

It can be written as a sum of positive squares in 2 ways, for example, as 46812964 + 98426241 = 6842^2 + 9921^2 .

It is not a de Polignac number, because 145239205 - 23 = 145239197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 14523916 + ... + 14523925.

It is an arithmetic number, because the mean of its divisors is an integer number (43571763).

Almost surely, 2145239205 is an apocalyptic number.

It is an amenable number.

145239205 is a deficient number, since it is larger than the sum of its proper divisors (29047847).

145239205 is an equidigital number, since it uses as much as digits as its factorization.

145239205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29047846.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 145239205 is about 12051.5229328081. The cubic root of 145239205 is about 525.6475215190.

The spelling of 145239205 in words is "one hundred forty-five million, two hundred thirty-nine thousand, two hundred five".

Divisors: 1 5 29047841 145239205