727121 has 2 divisors, whose sum is σ = 727122. Its totient is φ = 727120.

The previous prime is 727079. The next prime is 727123. The reversal of 727121 is 121727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 440896 + 286225 = 664^2 + 535^2 .

It is an emirp because it is prime and its reverse (121727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 727121 - 2¹⁰ = 726097 is a prime.

Together with 727123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 727093 and 727102.

It is not a weakly prime, because it can be changed into another prime (727123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363560 + 363561.

It is an arithmetic number, because the mean of its divisors is an integer number (363561).

2⁷²⁷¹²¹ is an apocalyptic number.

It is an amenable number.

727121 is a deficient number, since it is larger than the sum of its proper divisors (1).

727121 is an equidigital number, since it uses as much as digits as its factorization.

727121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196, while the sum is 20.

The square root of 727121 is about 852.7139027833. The cubic root of 727121 is about 89.9226083666.

Adding to 727121 its reverse (121727), we get a palindrome (848848).

It can be divided in two parts, 727 and 121, that added together give a palindrome (848).

The spelling of 727121 in words is "seven hundred twenty-seven thousand, one hundred twenty-one", and thus it is an iban number.