123120131513 has 2 divisors, whose sum is σ = 123120131514. Its totient is φ = 123120131512.

The previous prime is 123120131479. The next prime is 123120131527. The reversal of 123120131513 is 315131021321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99782069689 + 23338061824 = 315883^2 + 152768^2 .

It is a cyclic number.

It is not a de Polignac number, because 123120131513 - 2²⁰ = 123119082937 is a prime.

It is not a weakly prime, because it can be changed into another prime (123120130513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560065756 + 61560065757.

It is an arithmetic number, because the mean of its divisors is an integer number (61560065757).

Almost surely, 2^123120131513 is an apocalyptic number.

It is an amenable number.

123120131513 is a deficient number, since it is larger than the sum of its proper divisors (1).

123120131513 is an equidigital number, since it uses as much as digits as its factorization.

123120131513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 123120131513 its reverse (315131021321), we get a palindrome (438251152834).

The spelling of 123120131513 in words is "one hundred twenty-three billion, one hundred twenty million, one hundred thirty-one thousand, five hundred thirteen".