123140545 has 16 divisors (see below), whose sum is σ = 161834112. Its totient is φ = 89205760.

The previous prime is 123140527. The next prime is 123140557. The reversal of 123140545 is 545041321.

It is a happy number.

It is not a de Polignac number, because 123140545 - 2⁷ = 123140417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10209 + ... + 18721.

It is an arithmetic number, because the mean of its divisors is an integer number (10114632).

Almost surely, 2^123140545 is an apocalyptic number.

It is an amenable number.

123140545 is a deficient number, since it is larger than the sum of its proper divisors (38693567).

123140545 is a wasteful number, since it uses less digits than its factorization.

123140545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8792.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 123140545 is about 11096.8709553639. The cubic root of 123140545 is about 497.5083304582.

Adding to 123140545 its reverse (545041321), we get a palindrome (668181866).

The spelling of 123140545 in words is "one hundred twenty-three million, one hundred forty thousand, five hundred forty-five".