4978121 has 2 divisors, whose sum is σ = 4978122. Its totient is φ = 4978120.

The previous prime is 4978109. The next prime is 4978147. The reversal of 4978121 is 1218794.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4000000 + 978121 = 2000^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 4978121 - 2¹⁰ = 4977097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4978151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489060 + 2489061.

It is an arithmetic number, because the mean of its divisors is an integer number (2489061).

Almost surely, 2^4978121 is an apocalyptic number.

It is an amenable number.

4978121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4978121 is an equidigital number, since it uses as much as digits as its factorization.

4978121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 32.

The square root of 4978121 is about 2231.1703207062. The cubic root of 4978121 is about 170.7478128893.

It can be divided in two parts, 49781 and 21, that multiplied together give a palindrome (1045401).

The spelling of 4978121 in words is "four million, nine hundred seventy-eight thousand, one hundred twenty-one".