85866997 has 4 divisors (see below), whose sum is σ = 87961356. Its totient is φ = 83772640.

The previous prime is 85866971. The next prime is 85867003. The reversal of 85866997 is 79966858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36108081 + 49758916 = 6009^2 + 7054^2 .

It is a cyclic number.

It is not a de Polignac number, because 85866997 - 2¹¹ = 85864949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85866197) 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, 1047118 + ... + 1047199.

It is an arithmetic number, because the mean of its divisors is an integer number (21990339).

Almost surely, 2^85866997 is an apocalyptic number.

It is an amenable number.

85866997 is a deficient number, since it is larger than the sum of its proper divisors (2094359).

85866997 is a wasteful number, since it uses less digits than its factorization.

85866997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094358.

The product of its digits is 6531840, while the sum is 58.

The square root of 85866997 is about 9266.4446795953. Note that the first 3 decimals coincide. The cubic root of 85866997 is about 441.1728300392.

The spelling of 85866997 in words is "eighty-five million, eight hundred sixty-six thousand, nine hundred ninety-seven".