124242557 has 4 divisors (see below), whose sum is σ = 124273596. Its totient is φ = 124211520.

The previous prime is 124242551. The next prime is 124242611. The reversal of 124242557 is 755242421.

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 73633561 + 50608996 = 8581^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 124242557 - 2⁶ = 124242493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124242551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8438 + ... + 17879.

It is an arithmetic number, because the mean of its divisors is an integer number (31068399).

Almost surely, 2^124242557 is an apocalyptic number.

It is an amenable number.

124242557 is a deficient number, since it is larger than the sum of its proper divisors (31039).

124242557 is an equidigital number, since it uses as much as digits as its factorization.

124242557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31038.

The product of its digits is 22400, while the sum is 32.

The square root of 124242557 is about 11146.4145356253. The cubic root of 124242557 is about 498.9880292120.

Adding to 124242557 its reverse (755242421), we get a palindrome (879484978).

The spelling of 124242557 in words is "one hundred twenty-four million, two hundred forty-two thousand, five hundred fifty-seven".