85581829 has 2 divisors, whose sum is σ = 85581830. Its totient is φ = 85581828.

The previous prime is 85581823. The next prime is 85581857. The reversal of 85581829 is 92818558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60481729 + 25100100 = 7777^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 85581829 - 2⁷ = 85581701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85581823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42790914 + 42790915.

It is an arithmetic number, because the mean of its divisors is an integer number (42790915).

Almost surely, 2^85581829 is an apocalyptic number.

It is an amenable number.

85581829 is a deficient number, since it is larger than the sum of its proper divisors (1).

85581829 is an equidigital number, since it uses as much as digits as its factorization.

85581829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 46.

The square root of 85581829 is about 9251.0447518105. The cubic root of 85581829 is about 440.6839037260.

The spelling of 85581829 in words is "eighty-five million, five hundred eighty-one thousand, eight hundred twenty-nine".