85875781 has 2 divisors, whose sum is σ = 85875782. Its totient is φ = 85875780.

The previous prime is 85875761. The next prime is 85875793. The reversal of 85875781 is 18757858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59814756 + 26061025 = 7734^2 + 5105^2 .

It is a cyclic number.

It is not a de Polignac number, because 85875781 - 2¹³ = 85867589 is a prime.

It is a super-2 number, since 2×85875781² = 14749299524719922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85875761) 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, 42937890 + 42937891.

It is an arithmetic number, because the mean of its divisors is an integer number (42937891).

Almost surely, 2^85875781 is an apocalyptic number.

It is an amenable number.

85875781 is a deficient number, since it is larger than the sum of its proper divisors (1).

85875781 is an equidigital number, since it uses as much as digits as its factorization.

85875781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 49.

The square root of 85875781 is about 9266.9186356631. The cubic root of 85875781 is about 441.1878731878.

The spelling of 85875781 in words is "eighty-five million, eight hundred seventy-five thousand, seven hundred eighty-one".