85215951 has 12 divisors (see below), whose sum is σ = 130330512. Its totient is φ = 53468736.

The previous prime is 85215947. The next prime is 85215967. The reversal of 85215951 is 15951258.

It is a happy number.

It is not a de Polignac number, because 85215951 - 2² = 85215947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85215901) 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 11 ways as a sum of consecutive naturals, for example, 278331 + ... + 278636.

It is an arithmetic number, because the mean of its divisors is an integer number (10860876).

Almost surely, 2^85215951 is an apocalyptic number.

85215951 is a deficient number, since it is larger than the sum of its proper divisors (45114561).

85215951 is a wasteful number, since it uses less digits than its factorization.

85215951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556990 (or 556987 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

The square root of 85215951 is about 9231.2486154366. The cubic root of 85215951 is about 440.0550051758.

The spelling of 85215951 in words is "eighty-five million, two hundred fifteen thousand, nine hundred fifty-one".