85651971 has 4 divisors (see below), whose sum is σ = 114202632. Its totient is φ = 57101312.

The previous prime is 85651963. The next prime is 85652027. The reversal of 85651971 is 17915658.

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 85651971 - 2³ = 85651963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85651921) 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, 14275326 + ... + 14275331.

It is an arithmetic number, because the mean of its divisors is an integer number (28550658).

Almost surely, 2^85651971 is an apocalyptic number.

85651971 is a deficient number, since it is larger than the sum of its proper divisors (28550661).

85651971 is a wasteful number, since it uses less digits than its factorization.

85651971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28550660.

The product of its digits is 75600, while the sum is 42.

The square root of 85651971 is about 9254.8350066330. The cubic root of 85651971 is about 440.8042642041.

The spelling of 85651971 in words is "eighty-five million, six hundred fifty-one thousand, nine hundred seventy-one".