4947121 has 2 divisors, whose sum is σ = 4947122. Its totient is φ = 4947120.

The previous prime is 4947109. The next prime is 4947143. The reversal of 4947121 is 1217494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3748096 + 1199025 = 1936^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 4947121 - 2¹³ = 4938929 is a prime.

4947121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4947121.

It is not a weakly prime, because it can be changed into another prime (4947181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2473560 + 2473561.

It is an arithmetic number, because the mean of its divisors is an integer number (2473561).

Almost surely, 2^4947121 is an apocalyptic number.

It is an amenable number.

4947121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4947121 is an equidigital number, since it uses as much as digits as its factorization.

4947121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 4947121 is about 2224.2124448892. The cubic root of 4947121 is about 170.3926448992.

The spelling of 4947121 in words is "four million, nine hundred forty-seven thousand, one hundred twenty-one".