85211387 has 4 divisors (see below), whose sum is σ = 85568160. Its totient is φ = 84854616.

The previous prime is 85211383. The next prime is 85211393. The reversal of 85211387 is 78311258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78311258 = 2 ⋅39155629.

It is a cyclic number.

It is not a de Polignac number, because 85211387 - 2² = 85211383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85211381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178028 + ... + 178505.

It is an arithmetic number, because the mean of its divisors is an integer number (21392040).

Almost surely, 2^85211387 is an apocalyptic number.

85211387 is a deficient number, since it is larger than the sum of its proper divisors (356773).

85211387 is a wasteful number, since it uses less digits than its factorization.

85211387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356772.

The product of its digits is 13440, while the sum is 35.

The square root of 85211387 is about 9231.0014082980. The cubic root of 85211387 is about 440.0471488731.

The spelling of 85211387 in words is "eighty-five million, two hundred eleven thousand, three hundred eighty-seven".