124640557 has 4 divisors (see below), whose sum is σ = 124712476. Its totient is φ = 124568640.

The previous prime is 124640543. The next prime is 124640563. The reversal of 124640557 is 755046421.

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 75794436 + 48846121 = 8706^2 + 6989^2 .

It is a cyclic number.

It is not a de Polignac number, because 124640557 - 2¹⁵ = 124607789 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 (124640567) 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, 33294 + ... + 36847.

It is an arithmetic number, because the mean of its divisors is an integer number (31178119).

Almost surely, 2^124640557 is an apocalyptic number.

It is an amenable number.

124640557 is a deficient number, since it is larger than the sum of its proper divisors (71919).

124640557 is an equidigital number, since it uses as much as digits as its factorization.

124640557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71918.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 124640557 is about 11164.2535352795. The cubic root of 124640557 is about 499.5202825562.

Adding to 124640557 its reverse (755046421), we get a palindrome (879686978).

The spelling of 124640557 in words is "one hundred twenty-four million, six hundred forty thousand, five hundred fifty-seven".