85850551 has 2 divisors, whose sum is σ = 85850552. Its totient is φ = 85850550.

The previous prime is 85850549. The next prime is 85850587. The reversal of 85850551 is 15505858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85850551 - 2¹ = 85850549 is a prime.

Together with 85850549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 85850551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85850521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42925275 + 42925276.

It is an arithmetic number, because the mean of its divisors is an integer number (42925276).

Almost surely, 2^85850551 is an apocalyptic number.

85850551 is a deficient number, since it is larger than the sum of its proper divisors (1).

85850551 is an equidigital number, since it uses as much as digits as its factorization.

85850551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40000, while the sum is 37.

The square root of 85850551 is about 9265.5572417421. The cubic root of 85850551 is about 441.1446624782.

The spelling of 85850551 in words is "eighty-five million, eight hundred fifty thousand, five hundred fifty-one".