85092509 has 2 divisors, whose sum is σ = 85092510. Its totient is φ = 85092508.

The previous prime is 85092473. The next prime is 85092517. The reversal of 85092509 is 90529058.

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., 60062500 + 25030009 = 7750^2 + 5003^2 .

It is a cyclic number.

It is not a de Polignac number, because 85092509 - 2¹² = 85088413 is a prime.

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 (85092209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42546254 + 42546255.

It is an arithmetic number, because the mean of its divisors is an integer number (42546255).

Almost surely, 2^85092509 is an apocalyptic number.

It is an amenable number.

85092509 is a deficient number, since it is larger than the sum of its proper divisors (1).

85092509 is an equidigital number, since it uses as much as digits as its factorization.

85092509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 85092509 is about 9224.5600979125. The cubic root of 85092509 is about 439.8424177435.

The spelling of 85092509 in words is "eighty-five million, ninety-two thousand, five hundred nine".