65986231 has 4 divisors (see below), whose sum is σ = 69867792. Its totient is φ = 62104672.

The previous prime is 65986189. The next prime is 65986243. The reversal of 65986231 is 13268956.

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

It is not a de Polignac number, because 65986231 - 2¹¹ = 65984183 is a prime.

It is a super-2 number, since 2×65986231² = 8708365363170722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65986831) 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, 1940755 + ... + 1940788.

It is an arithmetic number, because the mean of its divisors is an integer number (17466948).

Almost surely, 2^65986231 is an apocalyptic number.

65986231 is a deficient number, since it is larger than the sum of its proper divisors (3881561).

65986231 is a wasteful number, since it uses less digits than its factorization.

65986231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881560.

The product of its digits is 77760, while the sum is 40.

The square root of 65986231 is about 8123.1909370641. The cubic root of 65986231 is about 404.0958971613.

The spelling of 65986231 in words is "sixty-five million, nine hundred eighty-six thousand, two hundred thirty-one".