85599551 has 2 divisors, whose sum is σ = 85599552. Its totient is φ = 85599550.

The previous prime is 85599533. The next prime is 85599557. The reversal of 85599551 is 15599558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85599551 - 2¹⁸ = 85337407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85599496 and 85599505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85599557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42799775 + 42799776.

It is an arithmetic number, because the mean of its divisors is an integer number (42799776).

Almost surely, 2^85599551 is an apocalyptic number.

85599551 is a deficient number, since it is larger than the sum of its proper divisors (1).

85599551 is an equidigital number, since it uses as much as digits as its factorization.

85599551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 405000, while the sum is 47.

The square root of 85599551 is about 9252.0025399910. The cubic root of 85599551 is about 440.7143200780.

Subtracting from 85599551 its sum of digits (47), we obtain a square (85599504 = 9252²).

The spelling of 85599551 in words is "eighty-five million, five hundred ninety-nine thousand, five hundred fifty-one".