65347621 has 2 divisors, whose sum is σ = 65347622. Its totient is φ = 65347620.

The previous prime is 65347613. The next prime is 65347637. The reversal of 65347621 is 12674356.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 16892100 = 6961^2 + 4110^2 .

It is a cyclic number.

It is not a de Polignac number, because 65347621 - 2³ = 65347613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65347651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32673810 + 32673811.

It is an arithmetic number, because the mean of its divisors is an integer number (32673811).

Almost surely, 2^65347621 is an apocalyptic number.

It is an amenable number.

65347621 is a deficient number, since it is larger than the sum of its proper divisors (1).

65347621 is an equidigital number, since it uses as much as digits as its factorization.

65347621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 65347621 is about 8083.7875405035. The cubic root of 65347621 is about 402.7880653283.

The spelling of 65347621 in words is "sixty-five million, three hundred forty-seven thousand, six hundred twenty-one".