Search a number
-
+
85821697 = 1340916141
BaseRepresentation
bin1010001110110…
…00100100000001
312222111012020101
411013120210001
5133432243242
612303242401
72061321013
oct507304401
9188435211
1085821697
1144498125
12248a9401
1314a1b190
14b5801b3
1578039b7
hex51d8901

85821697 has 8 divisors (see below), whose sum is σ = 92655080. Its totient is φ = 79021440.

The previous prime is 85821691. The next prime is 85821709. The reversal of 85821697 is 79612858.

It is a Cunningham number, because it is equal to 92642+1.

It can be written as a sum of positive squares in 4 ways, for example, as 12702096 + 73119601 = 3564^2 + 8551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85821697 - 211 = 85819649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85821691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2754 + ... + 13387.

It is an arithmetic number, because the mean of its divisors is an integer number (11581885).

Almost surely, 285821697 is an apocalyptic number.

It is an amenable number.

85821697 is a deficient number, since it is larger than the sum of its proper divisors (6833383).

85821697 is a wasteful number, since it uses less digits than its factorization.

85821697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16563.

The product of its digits is 241920, while the sum is 46.

The square root of 85821697 is about 9264.0000539724. Note that the first 4 decimals coincide. The cubic root of 85821697 is about 441.0952346673.

The spelling of 85821697 in words is "eighty-five million, eight hundred twenty-one thousand, six hundred ninety-seven".

Divisors: 1 13 409 5317 16141 209833 6601669 85821697