123055145531 has 4 divisors (see below), whose sum is σ = 123058540392. Its totient is φ = 123051750672.

The previous prime is 123055145519. The next prime is 123055145561. The reversal of 123055145531 is 135541550321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135541550321 = 174893 ⋅774997.

It is a cyclic number.

It is not a de Polignac number, because 123055145531 - 2¹⁴ = 123055129147 is a prime.

It is a super-2 number, since 2×123055145531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123055145491 and 123055145500.

It is not an unprimeable number, because it can be changed into a prime (123055145561) 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 in 3 ways as a sum of consecutive naturals, for example, 1642466 + ... + 1715751.

It is an arithmetic number, because the mean of its divisors is an integer number (30764635098).

Almost surely, 2^123055145531 is an apocalyptic number.

123055145531 is a deficient number, since it is larger than the sum of its proper divisors (3394861).

123055145531 is an equidigital number, since it uses as much as digits as its factorization.

123055145531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394860.

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 123055145531 its reverse (135541550321), we get a palindrome (258596695852).

The spelling of 123055145531 in words is "one hundred twenty-three billion, fifty-five million, one hundred forty-five thousand, five hundred thirty-one".