85566971 has 4 divisors (see below), whose sum is σ = 97790832. Its totient is φ = 73343112.

The previous prime is 85566953. The next prime is 85566979. The reversal of 85566971 is 17966558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17966558 = 2 ⋅8983279.

It is a cyclic number.

It is not a de Polignac number, because 85566971 - 2¹⁴ = 85550587 is a prime.

It is a super-2 number, since 2×85566971² = 14643413052229682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85566979) 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, 6111920 + ... + 6111933.

It is an arithmetic number, because the mean of its divisors is an integer number (24447708).

Almost surely, 2^85566971 is an apocalyptic number.

85566971 is a deficient number, since it is larger than the sum of its proper divisors (12223861).

85566971 is a wasteful number, since it uses less digits than its factorization.

85566971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12223860.

The product of its digits is 453600, while the sum is 47.

The square root of 85566971 is about 9250.2416725186. The cubic root of 85566971 is about 440.6583996344.

The spelling of 85566971 in words is "eighty-five million, five hundred sixty-six thousand, nine hundred seventy-one".