85547551 has 2 divisors, whose sum is σ = 85547552. Its totient is φ = 85547550.

The previous prime is 85547549. The next prime is 85547591. The reversal of 85547551 is 15574558.

It is a happy number.

It is an a-pointer prime, because the next prime (85547591) can be obtained adding 85547551 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85547551 - 2¹ = 85547549 is a prime.

Together with 85547549, 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 (85547531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42773775 + 42773776.

It is an arithmetic number, because the mean of its divisors is an integer number (42773776).

Almost surely, 2^85547551 is an apocalyptic number.

85547551 is a deficient number, since it is larger than the sum of its proper divisors (1).

85547551 is an equidigital number, since it uses as much as digits as its factorization.

85547551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140000, while the sum is 40.

The square root of 85547551 is about 9249.1919106482. The cubic root of 85547551 is about 440.6250603155.

The spelling of 85547551 in words is "eighty-five million, five hundred forty-seven thousand, five hundred fifty-one".