85421015 has 4 divisors (see below), whose sum is σ = 102505224. Its totient is φ = 68336808.

The previous prime is 85421009. The next prime is 85421033. The reversal of 85421015 is 51012458.

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

It is a cyclic number.

It is not a de Polignac number, because 85421015 - 2⁸ = 85420759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8542097 + ... + 8542106.

It is an arithmetic number, because the mean of its divisors is an integer number (25626306).

Almost surely, 2^85421015 is an apocalyptic number.

85421015 is a deficient number, since it is larger than the sum of its proper divisors (17084209).

85421015 is a wasteful number, since it uses less digits than its factorization.

85421015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17084208.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 85421015 is about 9242.3489979550. The cubic root of 85421015 is about 440.4077057792.

The spelling of 85421015 in words is "eighty-five million, four hundred twenty-one thousand, fifteen".