85523561 has 2 divisors, whose sum is σ = 85523562. Its totient is φ = 85523560.

The previous prime is 85523551. The next prime is 85523563. The reversal of 85523561 is 16532558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78659161 + 6864400 = 8869^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 85523561 - 2²² = 81329257 is a prime.

It is a super-2 number, since 2×85523561² = 14628558972241442, which contains 22 as substring.

Together with 85523563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85523563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42761780 + 42761781.

It is an arithmetic number, because the mean of its divisors is an integer number (42761781).

Almost surely, 2^85523561 is an apocalyptic number.

It is an amenable number.

85523561 is a deficient number, since it is larger than the sum of its proper divisors (1).

85523561 is an equidigital number, since it uses as much as digits as its factorization.

85523561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 35.

The square root of 85523561 is about 9247.8949496629. The cubic root of 85523561 is about 440.5838684742.

The spelling of 85523561 in words is "eighty-five million, five hundred twenty-three thousand, five hundred sixty-one".