65609431 has 2 divisors, whose sum is σ = 65609432. Its totient is φ = 65609430.

The previous prime is 65609419. The next prime is 65609441. The reversal of 65609431 is 13490656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65609431 - 2⁷ = 65609303 is a prime.

It is a super-2 number, since 2×65609431² = 8609194872287522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65609441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32804715 + 32804716.

It is an arithmetic number, because the mean of its divisors is an integer number (32804716).

Almost surely, 2^65609431 is an apocalyptic number.

65609431 is a deficient number, since it is larger than the sum of its proper divisors (1).

65609431 is an equidigital number, since it uses as much as digits as its factorization.

65609431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 65609431 is about 8099.9648764671. The cubic root of 65609431 is about 403.3252612429.

The spelling of 65609431 in words is "sixty-five million, six hundred nine thousand, four hundred thirty-one".