4405878121 has 2 divisors, whose sum is σ = 4405878122. Its totient is φ = 4405878120.

The previous prime is 4405878107. The next prime is 4405878143. The reversal of 4405878121 is 1218785044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3262694400 + 1143183721 = 57120^2 + 33811^2 .

It is a cyclic number.

It is not a de Polignac number, because 4405878121 - 2¹¹ = 4405876073 is a prime.

It is not a weakly prime, because it can be changed into another prime (4405828121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2202939060 + 2202939061.

It is an arithmetic number, because the mean of its divisors is an integer number (2202939061).

Almost surely, 2^4405878121 is an apocalyptic number.

It is an amenable number.

4405878121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4405878121 is an equidigital number, since it uses as much as digits as its factorization.

4405878121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 4405878121 is about 66376.7890229710. The cubic root of 4405878121 is about 1639.3719240047.

The spelling of 4405878121 in words is "four billion, four hundred five million, eight hundred seventy-eight thousand, one hundred twenty-one".