65469721 has 2 divisors, whose sum is σ = 65469722. Its totient is φ = 65469720.

The previous prime is 65469683. The next prime is 65469757. The reversal of 65469721 is 12796456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64979721 + 490000 = 8061^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 65469721 - 2¹⁵ = 65436953 is a prime.

It is not a weakly prime, because it can be changed into another prime (65469121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32734860 + 32734861.

It is an arithmetic number, because the mean of its divisors is an integer number (32734861).

Almost surely, 2^65469721 is an apocalyptic number.

It is an amenable number.

65469721 is a deficient number, since it is larger than the sum of its proper divisors (1).

65469721 is an equidigital number, since it uses as much as digits as its factorization.

65469721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 65469721 is about 8091.3361690144. The cubic root of 65469721 is about 403.0387749082.

The spelling of 65469721 in words is "sixty-five million, four hundred sixty-nine thousand, seven hundred twenty-one".