123143261 has 2 divisors, whose sum is σ = 123143262. Its totient is φ = 123143260.

The previous prime is 123143227. The next prime is 123143263. The reversal of 123143261 is 162341321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101808100 + 21335161 = 10090^2 + 4619^2 .

It is a cyclic number.

It is not a de Polignac number, because 123143261 - 2¹⁴ = 123126877 is a prime.

Together with 123143263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123143263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61571630 + 61571631.

It is an arithmetic number, because the mean of its divisors is an integer number (61571631).

Almost surely, 2^123143261 is an apocalyptic number.

It is an amenable number.

123143261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123143261 is an equidigital number, since it uses as much as digits as its factorization.

123143261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 123143261 is about 11096.9933315290. The cubic root of 123143261 is about 497.5119881289.

Adding to 123143261 its reverse (162341321), we get a palindrome (285484582).

The spelling of 123143261 in words is "one hundred twenty-three million, one hundred forty-three thousand, two hundred sixty-one".