65461891 has 4 divisors (see below), whose sum is σ = 71412984. Its totient is φ = 59510800.

The previous prime is 65461889. The next prime is 65461909. The reversal of 65461891 is 19816456.

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 65461891 - 2¹ = 65461889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65461831) 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, 2975530 + ... + 2975551.

It is an arithmetic number, because the mean of its divisors is an integer number (17853246).

Almost surely, 2^65461891 is an apocalyptic number.

65461891 is a deficient number, since it is larger than the sum of its proper divisors (5951093).

65461891 is a wasteful number, since it uses less digits than its factorization.

65461891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5951092.

The product of its digits is 51840, while the sum is 40.

The square root of 65461891 is about 8090.8523036822. The cubic root of 65461891 is about 403.0227068217.

The spelling of 65461891 in words is "sixty-five million, four hundred sixty-one thousand, eight hundred ninety-one".