65226509 has 2 divisors, whose sum is σ = 65226510. Its totient is φ = 65226508.

The previous prime is 65226461. The next prime is 65226521. The reversal of 65226509 is 90562256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40921609 + 24304900 = 6397^2 + 4930^2 .

It is a cyclic number.

It is not a de Polignac number, because 65226509 - 2¹² = 65222413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65226559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32613254 + 32613255.

It is an arithmetic number, because the mean of its divisors is an integer number (32613255).

Almost surely, 2^65226509 is an apocalyptic number.

It is an amenable number.

65226509 is a deficient number, since it is larger than the sum of its proper divisors (1).

65226509 is an equidigital number, since it uses as much as digits as its factorization.

65226509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 65226509 is about 8076.2930234112. The cubic root of 65226509 is about 402.5390757171.

It can be divided in two parts, 6522 and 6509, that added together give a palindrome (13031).

The spelling of 65226509 in words is "sixty-five million, two hundred twenty-six thousand, five hundred nine".