4085490109 has 2 divisors, whose sum is σ = 4085490110. Its totient is φ = 4085490108.

The previous prime is 4085490091. The next prime is 4085490113. The reversal of 4085490109 is 9010945804.

Together with previous prime (4085490091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2830772025 + 1254718084 = 53205^2 + 35422^2 .

It is a cyclic number.

It is not a de Polignac number, because 4085490109 - 2⁵ = 4085490077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4085490119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042745054 + 2042745055.

It is an arithmetic number, because the mean of its divisors is an integer number (2042745055).

Almost surely, 2^4085490109 is an apocalyptic number.

It is an amenable number.

4085490109 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085490109 is an equidigital number, since it uses as much as digits as its factorization.

4085490109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 4085490109 is about 63917.8387384930. The cubic root of 4085490109 is about 1598.6303524850.

The spelling of 4085490109 in words is "four billion, eighty-five million, four hundred ninety thousand, one hundred nine".