85524781 has 2 divisors, whose sum is σ = 85524782. Its totient is φ = 85524780.

The previous prime is 85524749. The next prime is 85524793. The reversal of 85524781 is 18742558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85470025 + 54756 = 9245^2 + 234^2 .

It is a cyclic number.

It is not a de Polignac number, because 85524781 - 2⁵ = 85524749 is a prime.

It is a super-2 number, since 2×85524781² = 14628976330195922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85524701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42762390 + 42762391.

It is an arithmetic number, because the mean of its divisors is an integer number (42762391).

Almost surely, 2^85524781 is an apocalyptic number.

It is an amenable number.

85524781 is a deficient number, since it is larger than the sum of its proper divisors (1).

85524781 is an equidigital number, since it uses as much as digits as its factorization.

85524781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 40.

The square root of 85524781 is about 9247.9609103845. The cubic root of 85524781 is about 440.5859634515.

The spelling of 85524781 in words is "eighty-five million, five hundred twenty-four thousand, seven hundred eighty-one".