123134505 has 16 divisors (see below), whose sum is σ = 212170560. Its totient is φ = 60619968.

The previous prime is 123134503. The next prime is 123134549. The reversal of 123134505 is 505431321.

It is not a de Polignac number, because 123134505 - 2¹ = 123134503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123134503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315535 + ... + 315924.

It is an arithmetic number, because the mean of its divisors is an integer number (13260660).

Almost surely, 2^123134505 is an apocalyptic number.

123134505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123134505 is a deficient number, since it is larger than the sum of its proper divisors (89036055).

123134505 is a wasteful number, since it uses less digits than its factorization.

123134505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631480.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 123134505 is about 11096.5988032370. The cubic root of 123134505 is about 497.5001961229.

Adding to 123134505 its reverse (505431321), we get a palindrome (628565826).

The spelling of 123134505 in words is "one hundred twenty-three million, one hundred thirty-four thousand, five hundred five".