Search a number
-
+
202681 = 292241
BaseRepresentation
bin110001011110111001
3101022000201
4301132321
522441211
64202201
71502623
oct613671
9338021
10202681
11129306
1299361
137133b
1453c13
15400c1
hex317b9

202681 has 6 divisors (see below), whose sum is σ = 210782. Its totient is φ = 194880.

The previous prime is 202679. The next prime is 202693. The reversal of 202681 is 186202.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 55225 + 147456 = 235^2 + 384^2 .

It is not a de Polignac number, because 202681 - 21 = 202679 is a prime.

It is a super-2 number, since 2×2026812 = 82159175522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202621) 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 5 ways as a sum of consecutive naturals, for example, 721 + ... + 961.

2202681 is an apocalyptic number.

202681 is the 241-st nonagonal number.

It is an amenable number.

202681 is a deficient number, since it is larger than the sum of its proper divisors (8101).

202681 is an equidigital number, since it uses as much as digits as its factorization.

202681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 202681 is about 450.2010661915. The cubic root of 202681 is about 58.7405054824.

Adding to 202681 its reverse (186202), we get a palindrome (388883).

It can be divided in two parts, 20 and 2681, that added together give a triangular number (2701 = T73).

The spelling of 202681 in words is "two hundred two thousand, six hundred eighty-one".

Divisors: 1 29 241 841 6989 202681