85785541 has 2 divisors, whose sum is σ = 85785542. Its totient is φ = 85785540.

The previous prime is 85785533. The next prime is 85785569. The reversal of 85785541 is 14558758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85488516 + 297025 = 9246^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 85785541 - 2³ = 85785533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85785521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42892770 + 42892771.

It is an arithmetic number, because the mean of its divisors is an integer number (42892771).

Almost surely, 2^85785541 is an apocalyptic number.

It is an amenable number.

85785541 is a deficient number, since it is larger than the sum of its proper divisors (1).

85785541 is an equidigital number, since it uses as much as digits as its factorization.

85785541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224000, while the sum is 43.

The square root of 85785541 is about 9262.0484235400. The cubic root of 85785541 is about 441.0332826590.

The spelling of 85785541 in words is "eighty-five million, seven hundred eighty-five thousand, five hundred forty-one".