123445111513 has 2 divisors, whose sum is σ = 123445111514. Its totient is φ = 123445111512.

The previous prime is 123445111481. The next prime is 123445111523. The reversal of 123445111513 is 315111544321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109661647104 + 13783464409 = 331152^2 + 117403^2 .

It is a cyclic number.

It is not a de Polignac number, because 123445111513 - 2⁵ = 123445111481 is a prime.

It is not a weakly prime, because it can be changed into another prime (123445111523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61722555756 + 61722555757.

It is an arithmetic number, because the mean of its divisors is an integer number (61722555757).

Almost surely, 2^123445111513 is an apocalyptic number.

It is an amenable number.

123445111513 is a deficient number, since it is larger than the sum of its proper divisors (1).

123445111513 is an equidigital number, since it uses as much as digits as its factorization.

123445111513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

Adding to 123445111513 its reverse (315111544321), we get a palindrome (438556655834).

The spelling of 123445111513 in words is "one hundred twenty-three billion, four hundred forty-five million, one hundred eleven thousand, five hundred thirteen".