85521143 has 2 divisors, whose sum is σ = 85521144. Its totient is φ = 85521142.

The previous prime is 85521127. The next prime is 85521167. The reversal of 85521143 is 34112558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85521143 - 2⁴ = 85521127 is a prime.

It is equal to p_4972304 and since 85521143 and 4972304 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85521103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42760571 + 42760572.

It is an arithmetic number, because the mean of its divisors is an integer number (42760572).

Almost surely, 2^85521143 is an apocalyptic number.

85521143 is a deficient number, since it is larger than the sum of its proper divisors (1).

85521143 is an equidigital number, since it uses as much as digits as its factorization.

85521143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 85521143 is about 9247.7642162849. The cubic root of 85521143 is about 440.5797162389.

The spelling of 85521143 in words is "eighty-five million, five hundred twenty-one thousand, one hundred forty-three".