65420309 has 2 divisors, whose sum is σ = 65420310. Its totient is φ = 65420308.

The previous prime is 65420293. The next prime is 65420359. The reversal of 65420309 is 90302456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48790225 + 16630084 = 6985^2 + 4078^2 .

It is a cyclic number.

It is not a de Polignac number, because 65420309 - 2⁴ = 65420293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65420359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32710154 + 32710155.

It is an arithmetic number, because the mean of its divisors is an integer number (32710155).

Almost surely, 2^65420309 is an apocalyptic number.

It is an amenable number.

65420309 is a deficient number, since it is larger than the sum of its proper divisors (1).

65420309 is an equidigital number, since it uses as much as digits as its factorization.

65420309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 65420309 is about 8088.2822032864. The cubic root of 65420309 is about 402.9373541604.

The spelling of 65420309 in words is "sixty-five million, four hundred twenty thousand, three hundred nine".