85311851 has 2 divisors, whose sum is σ = 85311852. Its totient is φ = 85311850.

The previous prime is 85311847. The next prime is 85311883. The reversal of 85311851 is 15811358.

It is a happy number.

It is an a-pointer prime, because the next prime (85311883) can be obtained adding 85311851 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85311851 - 2² = 85311847 is a prime.

It is a super-2 number, since 2×85311851² = 14556223842092402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85311841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42655925 + 42655926.

It is an arithmetic number, because the mean of its divisors is an integer number (42655926).

Almost surely, 2^85311851 is an apocalyptic number.

85311851 is a deficient number, since it is larger than the sum of its proper divisors (1).

85311851 is an equidigital number, since it uses as much as digits as its factorization.

85311851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 32.

The square root of 85311851 is about 9236.4414684444. The cubic root of 85311851 is about 440.2200190948.

The spelling of 85311851 in words is "eighty-five million, three hundred eleven thousand, eight hundred fifty-one".