123116545 has 4 divisors (see below), whose sum is σ = 147739860. Its totient is φ = 98493232.

The previous prime is 123116519. The next prime is 123116569. The reversal of 123116545 is 545611321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545611321 = 12409 ⋅43969.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 103958416 = 4377^2 + 10196^2 .

It is a cyclic number.

It is not a de Polignac number, because 123116545 - 2¹⁹ = 122592257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12311650 + ... + 12311659.

It is an arithmetic number, because the mean of its divisors is an integer number (36934965).

Almost surely, 2^123116545 is an apocalyptic number.

It is an amenable number.

123116545 is a deficient number, since it is larger than the sum of its proper divisors (24623315).

123116545 is an equidigital number, since it uses as much as digits as its factorization.

123116545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24623314.

The product of its digits is 3600, while the sum is 28.

The square root of 123116545 is about 11095.7895167491. The cubic root of 123116545 is about 497.4760070245.

Adding to 123116545 its reverse (545611321), we get a palindrome (668727866).

The spelling of 123116545 in words is "one hundred twenty-three million, one hundred sixteen thousand, five hundred forty-five".