123198539 has 2 divisors, whose sum is σ = 123198540. Its totient is φ = 123198538.

The previous prime is 123198499. The next prime is 123198547. The reversal of 123198539 is 935891321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123198539 - 2²⁴ = 106421323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123198496 and 123198505.

It is not a weakly prime, because it can be changed into another prime (123198599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61599269 + 61599270.

It is an arithmetic number, because the mean of its divisors is an integer number (61599270).

Almost surely, 2^123198539 is an apocalyptic number.

123198539 is a deficient number, since it is larger than the sum of its proper divisors (1).

123198539 is an equidigital number, since it uses as much as digits as its factorization.

123198539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 123198539 is about 11099.4837267325. The cubic root of 123198539 is about 497.5864200099.

The spelling of 123198539 in words is "one hundred twenty-three million, one hundred ninety-eight thousand, five hundred thirty-nine".