124775821 has 2 divisors, whose sum is σ = 124775822. Its totient is φ = 124775820.

The previous prime is 124775779. The next prime is 124775857. The reversal of 124775821 is 128577421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91298025 + 33477796 = 9555^2 + 5786^2 .

It is a cyclic number.

It is not a de Polignac number, because 124775821 - 2⁹ = 124775309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124775881) 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, 62387910 + 62387911.

It is an arithmetic number, because the mean of its divisors is an integer number (62387911).

Almost surely, 2^124775821 is an apocalyptic number.

It is an amenable number.

124775821 is a deficient number, since it is larger than the sum of its proper divisors (1).

124775821 is an equidigital number, since it uses as much as digits as its factorization.

124775821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 37.

The square root of 124775821 is about 11170.3097987478. The cubic root of 124775821 is about 499.7009157996.

The spelling of 124775821 in words is "one hundred twenty-four million, seven hundred seventy-five thousand, eight hundred twenty-one".