65390813 has 2 divisors, whose sum is σ = 65390814. Its totient is φ = 65390812.

The previous prime is 65390807. The next prime is 65390827. The reversal of 65390813 is 31809356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35557369 + 29833444 = 5963^2 + 5462^2 .

It is a cyclic number.

It is not a de Polignac number, because 65390813 - 2⁸ = 65390557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65393813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32695406 + 32695407.

It is an arithmetic number, because the mean of its divisors is an integer number (32695407).

Almost surely, 2^65390813 is an apocalyptic number.

It is an amenable number.

65390813 is a deficient number, since it is larger than the sum of its proper divisors (1).

65390813 is an equidigital number, since it uses as much as digits as its factorization.

65390813 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 65390813 is about 8086.4586191979. The cubic root of 65390813 is about 402.8767877144.

The spelling of 65390813 in words is "sixty-five million, three hundred ninety thousand, eight hundred thirteen".