65941891 has 4 divisors (see below), whose sum is σ = 66323232. Its totient is φ = 65560552.

The previous prime is 65941877. The next prime is 65941903. The reversal of 65941891 is 19814956.

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 65941891 - 2⁵ = 65941859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65941871) 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, 190411 + ... + 190756.

It is an arithmetic number, because the mean of its divisors is an integer number (16580808).

Almost surely, 2^65941891 is an apocalyptic number.

65941891 is a deficient number, since it is larger than the sum of its proper divisors (381341).

65941891 is a wasteful number, since it uses less digits than its factorization.

65941891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381340.

The product of its digits is 77760, while the sum is 43.

The square root of 65941891 is about 8120.4612553721. The cubic root of 65941891 is about 404.0053650073.

The spelling of 65941891 in words is "sixty-five million, nine hundred forty-one thousand, eight hundred ninety-one".