124888721 has 2 divisors, whose sum is σ = 124888722. Its totient is φ = 124888720.

The previous prime is 124888717. The next prime is 124888763. The reversal of 124888721 is 127888421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123654400 + 1234321 = 11120^2 + 1111^2 .

It is an emirp because it is prime and its reverse (127888421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124888721 - 2² = 124888717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (124888921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62444360 + 62444361.

It is an arithmetic number, because the mean of its divisors is an integer number (62444361).

Almost surely, 2^124888721 is an apocalyptic number.

It is an amenable number.

124888721 is a deficient number, since it is larger than the sum of its proper divisors (1).

124888721 is an equidigital number, since it uses as much as digits as its factorization.

124888721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57344, while the sum is 41.

The square root of 124888721 is about 11175.3622312657. The cubic root of 124888721 is about 499.8515839497.

The spelling of 124888721 in words is "one hundred twenty-four million, eight hundred eighty-eight thousand, seven hundred twenty-one".