85304489 has 2 divisors, whose sum is σ = 85304490. Its totient is φ = 85304488.

The previous prime is 85304431. The next prime is 85304533. The reversal of 85304489 is 98440358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53042089 + 32262400 = 7283^2 + 5680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85304489 is a prime.

It is a super-2 number, since 2×85304489² = 14553711687102242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85306489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42652244 + 42652245.

It is an arithmetic number, because the mean of its divisors is an integer number (42652245).

Almost surely, 2^85304489 is an apocalyptic number.

It is an amenable number.

85304489 is a deficient number, since it is larger than the sum of its proper divisors (1).

85304489 is an equidigital number, since it uses as much as digits as its factorization.

85304489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 85304489 is about 9236.0429297400. The cubic root of 85304489 is about 440.2073557779.

The spelling of 85304489 in words is "eighty-five million, three hundred four thousand, four hundred eighty-nine".