123543545 has 4 divisors (see below), whose sum is σ = 148252260. Its totient is φ = 98834832.

The previous prime is 123543533. The next prime is 123543547. The reversal of 123543545 is 545345321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545345321 = 467 ⋅1167763.

It can be written as a sum of positive squares in 2 ways, for example, as 59799289 + 63744256 = 7733^2 + 7984^2 .

It is a cyclic number.

It is not a de Polignac number, because 123543545 - 2²⁴ = 106766329 is a prime.

It is a super-2 number, since 2×123543545² = 30526015022334050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123543547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12354350 + ... + 12354359.

It is an arithmetic number, because the mean of its divisors is an integer number (37063065).

Almost surely, 2^123543545 is an apocalyptic number.

It is an amenable number.

123543545 is a deficient number, since it is larger than the sum of its proper divisors (24708715).

123543545 is an equidigital number, since it uses as much as digits as its factorization.

123543545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24708714.

The product of its digits is 36000, while the sum is 32.

The square root of 123543545 is about 11115.0143949524. The cubic root of 123543545 is about 498.0504685335.

Adding to 123543545 its reverse (545345321), we get a palindrome (668888866).

The spelling of 123543545 in words is "one hundred twenty-three million, five hundred forty-three thousand, five hundred forty-five".