85276781 has 2 divisors, whose sum is σ = 85276782. Its totient is φ = 85276780.

The previous prime is 85276747. The next prime is 85276813. The reversal of 85276781 is 18767258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68392900 + 16883881 = 8270^2 + 4109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85276781 is a prime.

It is a super-2 number, since 2×85276781² = 14544258755443922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85176781) 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, 42638390 + 42638391.

It is an arithmetic number, because the mean of its divisors is an integer number (42638391).

Almost surely, 2^85276781 is an apocalyptic number.

It is an amenable number.

85276781 is a deficient number, since it is larger than the sum of its proper divisors (1).

85276781 is an equidigital number, since it uses as much as digits as its factorization.

85276781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 85276781 is about 9234.5428148880. The cubic root of 85276781 is about 440.1596889380.

The spelling of 85276781 in words is "eighty-five million, two hundred seventy-six thousand, seven hundred eighty-one".