124536721 has 8 divisors (see below), whose sum is σ = 129011400. Its totient is φ = 120130560.

The previous prime is 124536689. The next prime is 124536739. The reversal of 124536721 is 127635421.

It can be written as a sum of positive squares in 4 ways, for example, as 8673025 + 115863696 = 2945^2 + 10764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 124536721 - 2⁵ = 124536689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124536821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13416 + ... + 20713.

It is an arithmetic number, because the mean of its divisors is an integer number (16126425).

Almost surely, 2^124536721 is an apocalyptic number.

It is an amenable number.

124536721 is a deficient number, since it is larger than the sum of its proper divisors (4474679).

124536721 is an equidigital number, since it uses as much as digits as its factorization.

124536721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34259.

The product of its digits is 10080, while the sum is 31.

The square root of 124536721 is about 11159.6021882503. The cubic root of 124536721 is about 499.3815299717.

The spelling of 124536721 in words is "one hundred twenty-four million, five hundred thirty-six thousand, seven hundred twenty-one".