123135555521203 has 2 divisors, whose sum is σ = 123135555521204. Its totient is φ = 123135555521202.

The previous prime is 123135555521191. The next prime is 123135555521243. The reversal of 123135555521203 is 302125555531321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123135555521203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123135555521203.

It is not a weakly prime, because it can be changed into another prime (123135555521243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61567777760601 + 61567777760602.

It is an arithmetic number, because the mean of its divisors is an integer number (61567777760602).

Almost surely, 2^{123135555521203} is an apocalyptic number.

123135555521203 is a deficient number, since it is larger than the sum of its proper divisors (1).

123135555521203 is an equidigital number, since it uses as much as digits as its factorization.

123135555521203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 675000, while the sum is 43.

The spelling of 123135555521203 in words is "one hundred twenty-three trillion, one hundred thirty-five billion, five hundred fifty-five million, five hundred twenty-one thousand, two hundred three".