123123132551131 has 4 divisors (see below), whose sum is σ = 124960791245992. Its totient is φ = 121285473856272.

The previous prime is 123123132551119. The next prime is 123123132551179. The reversal of 123123132551131 is 131155231321321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123123132551131 - 2¹¹ = 123123132549083 is a prime.

It is a super-2 number, since 2×123123132551131² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123123132552131) 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 in 3 ways as a sum of consecutive naturals, for example, 918829347330 + ... + 918829347463.

It is an arithmetic number, because the mean of its divisors is an integer number (31240197811498).

Almost surely, 2^{123123132551131} is an apocalyptic number.

123123132551131 is a deficient number, since it is larger than the sum of its proper divisors (1837658694861).

123123132551131 is an equidigital number, since it uses as much as digits as its factorization.

123123132551131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837658694860.

The product of its digits is 16200, while the sum is 34.

Adding to 123123132551131 its reverse (131155231321321), we get a palindrome (254278363872452).

The spelling of 123123132551131 in words is "one hundred twenty-three trillion, one hundred twenty-three billion, one hundred thirty-two million, five hundred fifty-one thousand, one hundred thirty-one".