3985285121 has 2 divisors, whose sum is σ = 3985285122. Its totient is φ = 3985285120.

The previous prime is 3985285111. The next prime is 3985285151. The reversal of 3985285121 is 1215825893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3827154496 + 158130625 = 61864^2 + 12575^2 .

It is a cyclic number.

It is not a de Polignac number, because 3985285121 - 2¹⁴ = 3985268737 is a prime.

It is not a weakly prime, because it can be changed into another prime (3985285111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992642560 + 1992642561.

It is an arithmetic number, because the mean of its divisors is an integer number (1992642561).

Almost surely, 2^3985285121 is an apocalyptic number.

It is an amenable number.

3985285121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3985285121 is an equidigital number, since it uses as much as digits as its factorization.

3985285121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 44.

The square root of 3985285121 is about 63129.1146856979. The cubic root of 3985285121 is about 1585.4521256260.

The spelling of 3985285121 in words is "three billion, nine hundred eighty-five million, two hundred eighty-five thousand, one hundred twenty-one".