143261 has 2 divisors, whose sum is σ = 143262. Its totient is φ = 143260.

The previous prime is 143257. The next prime is 143263. The reversal of 143261 is 162341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105625 + 37636 = 325^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 143261 - 2² = 143257 is a prime.

Together with 143263, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143263) 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 as a sum of consecutive naturals, namely, 71630 + 71631.

It is an arithmetic number, because the mean of its divisors is an integer number (71631).

2¹⁴³²⁶¹ is an apocalyptic number.

It is an amenable number.

143261 is a deficient number, since it is larger than the sum of its proper divisors (1).

143261 is an equidigital number, since it uses as much as digits as its factorization.

143261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 143261 is about 378.4983487414. The cubic root of 143261 is about 52.3250107347.

It can be divided in two parts, 143 and 261, that added together give a palindrome (404).

The spelling of 143261 in words is "one hundred forty-three thousand, two hundred sixty-one".