85215123 has 24 divisors (see below), whose sum is σ = 142661376. Its totient is φ = 48006000.

The previous prime is 85215103. The next prime is 85215131. The reversal of 85215123 is 32151258.

It is a happy number.

It is not a de Polignac number, because 85215123 - 2⁶ = 85215059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85215103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5053 + ... + 13998.

It is an arithmetic number, because the mean of its divisors is an integer number (5944224).

Almost surely, 2^85215123 is an apocalyptic number.

85215123 is a deficient number, since it is larger than the sum of its proper divisors (57446253).

85215123 is a wasteful number, since it uses less digits than its factorization.

85215123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19135 (or 19132 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 85215123 is about 9231.2037676567. The cubic root of 85215123 is about 440.0535799077.

The spelling of 85215123 in words is "eighty-five million, two hundred fifteen thousand, one hundred twenty-three".