85511599 has 2 divisors, whose sum is σ = 85511600. Its totient is φ = 85511598.

The previous prime is 85511597. The next prime is 85511617. The reversal of 85511599 is 99511558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85511599 - 2¹ = 85511597 is a prime.

Together with 85511597, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85511597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42755799 + 42755800.

It is an arithmetic number, because the mean of its divisors is an integer number (42755800).

Almost surely, 2^85511599 is an apocalyptic number.

85511599 is a deficient number, since it is larger than the sum of its proper divisors (1).

85511599 is an equidigital number, since it uses as much as digits as its factorization.

85511599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 43.

The square root of 85511599 is about 9247.2481852711. The cubic root of 85511599 is about 440.5633263378.

The spelling of 85511599 in words is "eighty-five million, five hundred eleven thousand, five hundred ninety-nine".