85442251 has 2 divisors, whose sum is σ = 85442252. Its totient is φ = 85442250.

The previous prime is 85442239. The next prime is 85442281. The reversal of 85442251 is 15224458.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85442251 - 2¹¹ = 85440203 is a prime.

It is not a weakly prime, because it can be changed into another prime (85442281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42721125 + 42721126.

It is an arithmetic number, because the mean of its divisors is an integer number (42721126).

Almost surely, 2^85442251 is an apocalyptic number.

85442251 is a deficient number, since it is larger than the sum of its proper divisors (1).

85442251 is an equidigital number, since it uses as much as digits as its factorization.

85442251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 31.

The square root of 85442251 is about 9243.4977687021. The cubic root of 85442251 is about 440.4441984507. Note that the first 3 decimals are identical.

The spelling of 85442251 in words is "eighty-five million, four hundred forty-two thousand, two hundred fifty-one".