124205551 has 2 divisors, whose sum is σ = 124205552. Its totient is φ = 124205550.

The previous prime is 124205539. The next prime is 124205567. The reversal of 124205551 is 155502421.

It is a weak prime.

It is an emirp because it is prime and its reverse (155502421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124205551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124205531) 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 as a sum of consecutive naturals, namely, 62102775 + 62102776.

It is an arithmetic number, because the mean of its divisors is an integer number (62102776).

Almost surely, 2^124205551 is an apocalyptic number.

124205551 is a deficient number, since it is larger than the sum of its proper divisors (1).

124205551 is an equidigital number, since it uses as much as digits as its factorization.

124205551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 124205551 is about 11144.7544163162. The cubic root of 124205551 is about 498.9384826232.

Adding to 124205551 its reverse (155502421), we get a palindrome (279707972).

It can be divided in two parts, 12420 and 5551, that added together give a palindrome (17971).

The spelling of 124205551 in words is "one hundred twenty-four million, two hundred five thousand, five hundred fifty-one".