123542521339 has 2 divisors, whose sum is σ = 123542521340. Its totient is φ = 123542521338.

The previous prime is 123542521327. The next prime is 123542521391. The reversal of 123542521339 is 933125245321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123542521339 - 2²³ = 123534132731 is a prime.

It is not a weakly prime, because it can be changed into another prime (123542521309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61771260669 + 61771260670.

It is an arithmetic number, because the mean of its divisors is an integer number (61771260670).

Almost surely, 2^123542521339 is an apocalyptic number.

123542521339 is a deficient number, since it is larger than the sum of its proper divisors (1).

123542521339 is an equidigital number, since it uses as much as digits as its factorization.

123542521339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 40.

The spelling of 123542521339 in words is "one hundred twenty-three billion, five hundred forty-two million, five hundred twenty-one thousand, three hundred thirty-nine".