11721725 has 6 divisors (see below), whose sum is σ = 14534970. Its totient is φ = 9377360.

The previous prime is 11721691. The next prime is 11721733. The reversal of 11721725 is 52712711.

It can be written as a sum of positive squares in 3 ways, for example, as 1653796 + 10067929 = 1286^2 + 3173^2 .

It is not a de Polignac number, because 11721725 - 2²⁰ = 10673149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11721694 and 11721703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 234410 + ... + 234459.

It is an arithmetic number, because the mean of its divisors is an integer number (2422495).

Almost surely, 2^11721725 is an apocalyptic number.

It is an amenable number.

11721725 is a deficient number, since it is larger than the sum of its proper divisors (2813245).

11721725 is an equidigital number, since it uses as much as digits as its factorization.

11721725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468879 (or 468874 counting only the distinct ones).

The product of its digits is 980, while the sum is 26.

The square root of 11721725 is about 3423.7004833951. The cubic root of 11721725 is about 227.1592935755.

The spelling of 11721725 in words is "eleven million, seven hundred twenty-one thousand, seven hundred twenty-five".