85987829 has 2 divisors, whose sum is σ = 85987830. Its totient is φ = 85987828.

The previous prime is 85987817. The next prime is 85987843. The reversal of 85987829 is 92878958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84676804 + 1311025 = 9202^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 85987829 - 2¹⁶ = 85922293 is a prime.

It is a super-2 number, since 2×85987829² = 14787813472266482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85987859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42993914 + 42993915.

It is an arithmetic number, because the mean of its divisors is an integer number (42993915).

Almost surely, 2^85987829 is an apocalyptic number.

It is an amenable number.

85987829 is a deficient number, since it is larger than the sum of its proper divisors (1).

85987829 is an equidigital number, since it uses as much as digits as its factorization.

85987829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 56.

The square root of 85987829 is about 9272.9622559353. The cubic root of 85987829 is about 441.3796724500.

It can be divided in two parts, 859 and 87829, that added together give a palindrome (88688).

The spelling of 85987829 in words is "eighty-five million, nine hundred eighty-seven thousand, eight hundred twenty-nine".