123544215013 has 2 divisors, whose sum is σ = 123544215014. Its totient is φ = 123544215012.

The previous prime is 123544215001. The next prime is 123544215031. The reversal of 123544215013 is 310512445321.

Together with next prime (123544215031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83069615524 + 40474599489 = 288218^2 + 201183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123544215013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123544215713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61772107506 + 61772107507.

It is an arithmetic number, because the mean of its divisors is an integer number (61772107507).

Almost surely, 2^123544215013 is an apocalyptic number.

It is an amenable number.

123544215013 is a deficient number, since it is larger than the sum of its proper divisors (1).

123544215013 is an equidigital number, since it uses as much as digits as its factorization.

123544215013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 123544215013 in words is "one hundred twenty-three billion, five hundred forty-four million, two hundred fifteen thousand, thirteen".