65309813 has 2 divisors, whose sum is σ = 65309814. Its totient is φ = 65309812.

The previous prime is 65309779. The next prime is 65309851. The reversal of 65309813 is 31890356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42289009 + 23020804 = 6503^2 + 4798^2 .

It is a cyclic number.

It is not a de Polignac number, because 65309813 - 2⁸ = 65309557 is a prime.

It is equal to p_3857741 and since 65309813 and 3857741 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65309863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32654906 + 32654907.

It is an arithmetic number, because the mean of its divisors is an integer number (32654907).

Almost surely, 2^65309813 is an apocalyptic number.

It is an amenable number.

65309813 is a deficient number, since it is larger than the sum of its proper divisors (1).

65309813 is an equidigital number, since it uses as much as digits as its factorization.

65309813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 65309813 is about 8081.4486943864. The cubic root of 65309813 is about 402.7103703344.

The spelling of 65309813 in words is "sixty-five million, three hundred nine thousand, eight hundred thirteen".