85291081 has 2 divisors, whose sum is σ = 85291082. Its totient is φ = 85291080.

The previous prime is 85291079. The next prime is 85291097. The reversal of 85291081 is 18019258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74235456 + 11055625 = 8616^2 + 3325^2 .

It is a cyclic number.

It is not a de Polignac number, because 85291081 - 2¹ = 85291079 is a prime.

It is a super-2 number, since 2×85291081² = 14549136996297122, which contains 22 as substring.

Together with 85291079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85291051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42645540 + 42645541.

It is an arithmetic number, because the mean of its divisors is an integer number (42645541).

Almost surely, 2^85291081 is an apocalyptic number.

It is an amenable number.

85291081 is a deficient number, since it is larger than the sum of its proper divisors (1).

85291081 is an equidigital number, since it uses as much as digits as its factorization.

85291081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 85291081 is about 9235.3170492409. The cubic root of 85291081 is about 440.1842909132.

The spelling of 85291081 in words is "eighty-five million, two hundred ninety-one thousand, eighty-one".