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85628581 is a prime number
BaseRepresentation
bin1010001101010…
…01011010100101
312222010101022221
411012221122211
5133410103311
612255152341
72056555003
oct506513245
9188111287
1085628581
1144376025
12248156b1
13149812cc
14b52da73
1577b6671
hex51a96a5

85628581 has 2 divisors, whose sum is σ = 85628582. Its totient is φ = 85628580.

The previous prime is 85628579. The next prime is 85628597. The reversal of 85628581 is 18582658.

85628581 is nontrivially palindromic in base 3.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73788100 + 11840481 = 8590^2 + 3441^2 .

It is a cyclic number.

It is not a de Polignac number, because 85628581 - 21 = 85628579 is a prime.

It is a super-2 number, since 2×856285812 = 14664507768147122, which contains 22 as substring.

Together with 85628579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85628551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42814290 + 42814291.

It is an arithmetic number, because the mean of its divisors is an integer number (42814291).

Almost surely, 285628581 is an apocalyptic number.

It is an amenable number.

85628581 is a deficient number, since it is larger than the sum of its proper divisors (1).

85628581 is an equidigital number, since it uses as much as digits as its factorization.

85628581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153600, while the sum is 43.

The square root of 85628581 is about 9253.5712565474. The cubic root of 85628581 is about 440.7641353342.

The spelling of 85628581 in words is "eighty-five million, six hundred twenty-eight thousand, five hundred eighty-one".