85056991 has 2 divisors, whose sum is σ = 85056992. Its totient is φ = 85056990.

The previous prime is 85056953. The next prime is 85057003. The reversal of 85056991 is 19965058.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85056991 - 2¹⁹ = 84532703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85056911) 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, 42528495 + 42528496.

It is an arithmetic number, because the mean of its divisors is an integer number (42528496).

Almost surely, 2^85056991 is an apocalyptic number.

85056991 is a deficient number, since it is larger than the sum of its proper divisors (1).

85056991 is an equidigital number, since it uses as much as digits as its factorization.

85056991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 85056991 is about 9222.6347103200. The cubic root of 85056991 is about 439.7812118188.

The spelling of 85056991 in words is "eighty-five million, fifty-six thousand, nine hundred ninety-one".