65219891 has 8 divisors (see below), whose sum is σ = 71207424. Its totient is φ = 59242120.

The previous prime is 65219873. The next prime is 65219893. The reversal of 65219891 is 19891256.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65219891 - 2¹⁸ = 64957747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65219893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25430 + ... + 27876.

It is an arithmetic number, because the mean of its divisors is an integer number (8900928).

Almost surely, 2^65219891 is an apocalyptic number.

65219891 is a deficient number, since it is larger than the sum of its proper divisors (5987533).

65219891 is a wasteful number, since it uses less digits than its factorization.

65219891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4881.

The product of its digits is 38880, while the sum is 41.

The square root of 65219891 is about 8075.8832953430. The cubic root of 65219891 is about 402.5254611416.

It can be divided in two parts, 65219 and 891, that multiplied together give a square (58110129 = 7623²).

The spelling of 65219891 in words is "sixty-five million, two hundred nineteen thousand, eight hundred ninety-one".