65347921 has 8 divisors (see below), whose sum is σ = 66389544. Its totient is φ = 64310400.

The previous prime is 65347913. The next prime is 65347937. The reversal of 65347921 is 12974356.

It can be written as a sum of positive squares in 4 ways, for example, as 27709696 + 37638225 = 5264^2 + 6135^2 .

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 65347921 - 2³ = 65347913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65347621) 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, 50535 + ... + 51811.

It is an arithmetic number, because the mean of its divisors is an integer number (8298693).

Almost surely, 2^65347921 is an apocalyptic number.

It is an amenable number.

65347921 is a deficient number, since it is larger than the sum of its proper divisors (1041623).

65347921 is a wasteful number, since it uses less digits than its factorization.

65347921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051.

The product of its digits is 45360, while the sum is 37.

The square root of 65347921 is about 8083.8060961406. The cubic root of 65347921 is about 402.7886817049.

Subtracting from 65347921 its product of digits (45360), we obtain a square (65302561 = 8081²).

The spelling of 65347921 in words is "sixty-five million, three hundred forty-seven thousand, nine hundred twenty-one".