85291109 has 2 divisors, whose sum is σ = 85291110. Its totient is φ = 85291108.

The previous prime is 85291097. The next prime is 85291121. The reversal of 85291109 is 90119258.

It is a balanced prime because it is at equal distance from previous prime (85291097) and next prime (85291121).

It can be written as a sum of positive squares in only one way, i.e., 58094884 + 27196225 = 7622^2 + 5215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85291109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85291169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42645554 + 42645555.

It is an arithmetic number, because the mean of its divisors is an integer number (42645555).

Almost surely, 2^85291109 is an apocalyptic number.

It is an amenable number.

85291109 is a deficient number, since it is larger than the sum of its proper divisors (1).

85291109 is an equidigital number, since it uses as much as digits as its factorization.

85291109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 85291109 is about 9235.3185651606. The cubic root of 85291109 is about 440.1843390822.

The spelling of 85291109 in words is "eighty-five million, two hundred ninety-one thousand, one hundred nine".