4155121 has 2 divisors, whose sum is σ = 4155122. Its totient is φ = 4155120.

The previous prime is 4155119. The next prime is 4155161. The reversal of 4155121 is 1215514.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3474496 + 680625 = 1864^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 4155121 - 2¹ = 4155119 is a prime.

Together with 4155119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4155161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2077560 + 2077561.

It is an arithmetic number, because the mean of its divisors is an integer number (2077561).

Almost surely, 2^4155121 is an apocalyptic number.

It is an amenable number.

4155121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4155121 is an equidigital number, since it uses as much as digits as its factorization.

4155121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200, while the sum is 19.

The square root of 4155121 is about 2038.4113912555. The cubic root of 4155121 is about 160.7661303589.

The spelling of 4155121 in words is "four million, one hundred fifty-five thousand, one hundred twenty-one".