85777481 has 4 divisors (see below), whose sum is σ = 86403732. Its totient is φ = 85151232.

The previous prime is 85777469. The next prime is 85777501. The reversal of 85777481 is 18477758.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48372025 + 37405456 = 6955^2 + 6116^2 .

It is a cyclic number.

It is not a de Polignac number, because 85777481 - 2¹⁸ = 85515337 is a prime.

It is a super-2 number, since 2×85777481² = 14715552493410722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85771481) 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 in 3 ways as a sum of consecutive naturals, for example, 312920 + ... + 313193.

It is an arithmetic number, because the mean of its divisors is an integer number (21600933).

Almost surely, 2^85777481 is an apocalyptic number.

It is an amenable number.

85777481 is a deficient number, since it is larger than the sum of its proper divisors (626251).

85777481 is a wasteful number, since it uses less digits than its factorization.

85777481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626250.

The product of its digits is 439040, while the sum is 47.

The square root of 85777481 is about 9261.6133043871. The cubic root of 85777481 is about 441.0194697657.

The spelling of 85777481 in words is "eighty-five million, seven hundred seventy-seven thousand, four hundred eighty-one".