123011122261 has 2 divisors, whose sum is σ = 123011122262. Its totient is φ = 123011122260.

The previous prime is 123011122253. The next prime is 123011122309. The reversal of 123011122261 is 162221110321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86616021636 + 36395100625 = 294306^2 + 190775^2 .

It is a cyclic number.

It is not a de Polignac number, because 123011122261 - 2³ = 123011122253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123011122231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61505561130 + 61505561131.

It is an arithmetic number, because the mean of its divisors is an integer number (61505561131).

Almost surely, 2^123011122261 is an apocalyptic number.

It is an amenable number.

123011122261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123011122261 is an equidigital number, since it uses as much as digits as its factorization.

123011122261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 123011122261 its reverse (162221110321), we get a palindrome (285232232582).

The spelling of 123011122261 in words is "one hundred twenty-three billion, eleven million, one hundred twenty-two thousand, two hundred sixty-one".