123916545 has 24 divisors (see below), whose sum is σ = 215168616. Its totient is φ = 65971968.

The previous prime is 123916543. The next prime is 123916577. The reversal of 123916545 is 545619321.

123916545 is a `hidden beast` number, since 1 + 23 + 91 + 6 + 545 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19079424 + 104837121 = 4368^2 + 10239^2 .

It is not a de Polignac number, because 123916545 - 2¹ = 123916543 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (123916543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27277 + ... + 31493.

It is an arithmetic number, because the mean of its divisors is an integer number (8965359).

Almost surely, 2^123916545 is an apocalyptic number.

123916545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123916545 is a deficient number, since it is larger than the sum of its proper divisors (91252071).

123916545 is a wasteful number, since it uses less digits than its factorization.

123916545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4881 (or 4878 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 123916545 is about 11131.7808548318. The cubic root of 123916545 is about 498.5511993414.

The spelling of 123916545 in words is "one hundred twenty-three million, nine hundred sixteen thousand, five hundred forty-five".