65497409 has 2 divisors, whose sum is σ = 65497410. Its totient is φ = 65497408.

The previous prime is 65497403. The next prime is 65497433. The reversal of 65497409 is 90479456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50013184 + 15484225 = 7072^2 + 3935^2 .

It is a cyclic number.

It is not a de Polignac number, because 65497409 - 2²⁰ = 64448833 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65497409.

It is not a weakly prime, because it can be changed into another prime (65497403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32748704 + 32748705.

It is an arithmetic number, because the mean of its divisors is an integer number (32748705).

Almost surely, 2^65497409 is an apocalyptic number.

It is an amenable number.

65497409 is a deficient number, since it is larger than the sum of its proper divisors (1).

65497409 is an equidigital number, since it uses as much as digits as its factorization.

65497409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 65497409 is about 8093.0469540217. The cubic root of 65497409 is about 403.0955836877.

The spelling of 65497409 in words is "sixty-five million, four hundred ninety-seven thousand, four hundred nine".