123019513 has 2 divisors, whose sum is σ = 123019514. Its totient is φ = 123019512.

The previous prime is 123019489. The next prime is 123019553. The reversal of 123019513 is 315910321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122832889 + 186624 = 11083^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 123019513 - 2¹³ = 123011321 is a prime.

It is not a weakly prime, because it can be changed into another prime (123019553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61509756 + 61509757.

It is an arithmetic number, because the mean of its divisors is an integer number (61509757).

Almost surely, 2^123019513 is an apocalyptic number.

It is an amenable number.

123019513 is a deficient number, since it is larger than the sum of its proper divisors (1).

123019513 is an equidigital number, since it uses as much as digits as its factorization.

123019513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 123019513 is about 11091.4161855013. The cubic root of 123019513 is about 497.3452805415.

Adding to 123019513 its reverse (315910321), we get a palindrome (438929834).

The spelling of 123019513 in words is "one hundred twenty-three million, nineteen thousand, five hundred thirteen".