65238409 has 2 divisors, whose sum is σ = 65238410. Its totient is φ = 65238408.

The previous prime is 65238391. The next prime is 65238431. The reversal of 65238409 is 90483256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65157184 + 81225 = 8072^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 65238409 - 2⁵ = 65238377 is a prime.

It is not a weakly prime, because it can be changed into another prime (65238709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32619204 + 32619205.

It is an arithmetic number, because the mean of its divisors is an integer number (32619205).

Almost surely, 2^65238409 is an apocalyptic number.

It is an amenable number.

65238409 is a deficient number, since it is larger than the sum of its proper divisors (1).

65238409 is an equidigital number, since it uses as much as digits as its factorization.

65238409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 65238409 is about 8077.0297139481. The cubic root of 65238409 is about 402.5635541273.

The spelling of 65238409 in words is "sixty-five million, two hundred thirty-eight thousand, four hundred nine".