124166561 has 4 divisors (see below), whose sum is σ = 127522452. Its totient is φ = 120810672.

The previous prime is 124166551. The next prime is 124166569. The reversal of 124166561 is 165661421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65934400 + 58232161 = 8120^2 + 7631^2 .

It is a cyclic number.

It is not a de Polignac number, because 124166561 - 2¹⁰ = 124165537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (124166569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1677890 + ... + 1677963.

It is an arithmetic number, because the mean of its divisors is an integer number (31880613).

Almost surely, 2^124166561 is an apocalyptic number.

It is an amenable number.

124166561 is a deficient number, since it is larger than the sum of its proper divisors (3355891).

124166561 is an equidigital number, since it uses as much as digits as its factorization.

124166561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3355890.

The product of its digits is 8640, while the sum is 32.

The square root of 124166561 is about 11143.0050255755. The cubic root of 124166561 is about 498.8862690487.

The spelling of 124166561 in words is "one hundred twenty-four million, one hundred sixty-six thousand, five hundred sixty-one".