124890561 has 6 divisors (see below), whose sum is σ = 180397490. Its totient is φ = 83260368.

The previous prime is 124890539. The next prime is 124890581. The reversal of 124890561 is 165098421.

124890561 is a `hidden beast` number, since 1 + 2 + 4 + 8 + 90 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 67963536 + 56927025 = 8244^2 + 7545^2 .

It is not a de Polignac number, because 124890561 - 2⁶ = 124890497 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 (124890511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6938356 + ... + 6938373.

Almost surely, 2^124890561 is an apocalyptic number.

It is an amenable number.

124890561 is a deficient number, since it is larger than the sum of its proper divisors (55506929).

124890561 is a wasteful number, since it uses less digits than its factorization.

124890561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13876735 (or 13876732 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 124890561 is about 11175.4445549159. Note that the first 3 decimals coincide. The cubic root of 124890561 is about 499.8540387281.

It can be divided in two parts, 1248 and 90561, that added together give a square (91809 = 303²).

The spelling of 124890561 in words is "one hundred twenty-four million, eight hundred ninety thousand, five hundred sixty-one".