1013123423261 has 2 divisors, whose sum is σ = 1013123423262. Its totient is φ = 1013123423260.

The previous prime is 1013123423237. The next prime is 1013123423401. The reversal of 1013123423261 is 1623243213101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988395860761 + 24727562500 = 994181^2 + 157250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013123423261 - 2³⁰ = 1012049681437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1013123423461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506561711630 + 506561711631.

It is an arithmetic number, because the mean of its divisors is an integer number (506561711631).

Almost surely, 2^{1013123423261} is an apocalyptic number.

It is an amenable number.

1013123423261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013123423261 is an equidigital number, since it uses as much as digits as its factorization.

1013123423261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 1013123423261 its reverse (1623243213101), we get a palindrome (2636366636362).

The spelling of 1013123423261 in words is "one trillion, thirteen billion, one hundred twenty-three million, four hundred twenty-three thousand, two hundred sixty-one".