85890109 has 2 divisors, whose sum is σ = 85890110. Its totient is φ = 85890108.

The previous prime is 85890053. The next prime is 85890113. The reversal of 85890109 is 90109858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77352025 + 8538084 = 8795^2 + 2922^2 .

It is a cyclic number.

It is not a de Polignac number, because 85890109 - 2⁹ = 85889597 is a prime.

It is a super-2 number, since 2×85890109² = 14754221648063762, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85890149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42945054 + 42945055.

It is an arithmetic number, because the mean of its divisors is an integer number (42945055).

Almost surely, 2^85890109 is an apocalyptic number.

It is an amenable number.

85890109 is a deficient number, since it is larger than the sum of its proper divisors (1).

85890109 is an equidigital number, since it uses as much as digits as its factorization.

85890109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 85890109 is about 9267.6916759245. The cubic root of 85890109 is about 441.2124085816.

The spelling of 85890109 in words is "eighty-five million, eight hundred ninety thousand, one hundred nine".