123544450531501 has 2 divisors, whose sum is σ = 123544450531502. Its totient is φ = 123544450531500.

The previous prime is 123544450531459. The next prime is 123544450531561. The reversal of 123544450531501 is 105135054445321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95480160246025 + 28064290285476 = 9771395^2 + 5297574^2 .

It is an emirp because it is prime and its reverse (105135054445321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123544450531501 - 2¹¹ = 123544450529453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123544450531561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61772225265750 + 61772225265751.

It is an arithmetic number, because the mean of its divisors is an integer number (61772225265751).

Almost surely, 2^{123544450531501} is an apocalyptic number.

It is an amenable number.

123544450531501 is a deficient number, since it is larger than the sum of its proper divisors (1).

123544450531501 is an equidigital number, since it uses as much as digits as its factorization.

123544450531501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 123544450531501 in words is "one hundred twenty-three trillion, five hundred forty-four billion, four hundred fifty million, five hundred thirty-one thousand, five hundred one".