85619509 has 2 divisors, whose sum is σ = 85619510. Its totient is φ = 85619508.

The previous prime is 85619483. The next prime is 85619533. The reversal of 85619509 is 90591658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81396484 + 4223025 = 9022^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 85619509 - 2¹¹ = 85617461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85613509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42809754 + 42809755.

It is an arithmetic number, because the mean of its divisors is an integer number (42809755).

Almost surely, 2^85619509 is an apocalyptic number.

It is an amenable number.

85619509 is a deficient number, since it is larger than the sum of its proper divisors (1).

85619509 is an equidigital number, since it uses as much as digits as its factorization.

85619509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 85619509 is about 9253.0810544380. The cubic root of 85619509 is about 440.7485690618.

The spelling of 85619509 in words is "eighty-five million, six hundred nineteen thousand, five hundred nine".