85421129 has 4 divisors (see below), whose sum is σ = 85460676. Its totient is φ = 85381584.

The previous prime is 85421117. The next prime is 85421159. The reversal of 85421129 is 92112458.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64963600 + 20457529 = 8060^2 + 4523^2 .

It is a cyclic number.

It is not a de Polignac number, because 85421129 - 2⁴ = 85421113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85421095 and 85421104.

It is not an unprimeable number, because it can be changed into a prime (85421159) 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 in 3 ways as a sum of consecutive naturals, for example, 16334 + ... + 20919.

It is an arithmetic number, because the mean of its divisors is an integer number (21365169).

Almost surely, 2^85421129 is an apocalyptic number.

It is an amenable number.

85421129 is a deficient number, since it is larger than the sum of its proper divisors (39547).

85421129 is a wasteful number, since it uses less digits than its factorization.

85421129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39546.

The product of its digits is 5760, while the sum is 32.

The square root of 85421129 is about 9242.3551652163. The cubic root of 85421129 is about 440.4079016968.

The spelling of 85421129 in words is "eighty-five million, four hundred twenty-one thousand, one hundred twenty-nine".