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204243031 = 1559131009
BaseRepresentation
bin11000010110010…
…00000001010111
3112020022121202201
430023020001113
5404241234111
632133345331
75030015506
oct1413100127
9466277681
10204243031
11a53208a3
1258498247
1333411685
141d1a883d
1512de66c1
hexc2c8057

204243031 has 4 divisors (see below), whose sum is σ = 204375600. Its totient is φ = 204110464.

The previous prime is 204243007. The next prime is 204243047. The reversal of 204243031 is 130342402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130342402 = 265171201.

It is a cyclic number.

It is not a de Polignac number, because 204243031 - 25 = 204242999 is a prime.

It is a super-2 number, since 2×2042430312 = 83430431424133922, 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 (204243131) 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, 63946 + ... + 67063.

It is an arithmetic number, because the mean of its divisors is an integer number (51093900).

Almost surely, 2204243031 is an apocalyptic number.

204243031 is a deficient number, since it is larger than the sum of its proper divisors (132569).

204243031 is a wasteful number, since it uses less digits than its factorization.

204243031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132568.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 204243031 is about 14291.3621114294. The cubic root of 204243031 is about 588.9102079475.

Adding to 204243031 its reverse (130342402), we get a palindrome (334585433).

The spelling of 204243031 in words is "two hundred four million, two hundred forty-three thousand, thirty-one".

Divisors: 1 1559 131009 204243031