123404261 has 2 divisors, whose sum is σ = 123404262. Its totient is φ = 123404260.

The previous prime is 123404231. The next prime is 123404263. The reversal of 123404261 is 162404321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93973636 + 29430625 = 9694^2 + 5425^2 .

It is a cyclic number.

It is not a de Polignac number, because 123404261 - 2¹⁰ = 123403237 is a prime.

It is a super-2 number, since 2×123404261² = 30457223265912242, which contains 22 as substring.

Together with 123404263, 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 (123404263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61702130 + 61702131.

It is an arithmetic number, because the mean of its divisors is an integer number (61702131).

Almost surely, 2^123404261 is an apocalyptic number.

It is an amenable number.

123404261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123404261 is an equidigital number, since it uses as much as digits as its factorization.

123404261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 123404261 is about 11108.7470490600. The cubic root of 123404261 is about 497.8632294311.

Adding to 123404261 its reverse (162404321), we get a palindrome (285808582).

The spelling of 123404261 in words is "one hundred twenty-three million, four hundred four thousand, two hundred sixty-one".