64190509 has 2 divisors, whose sum is σ = 64190510. Its totient is φ = 64190508.

The previous prime is 64190479. The next prime is 64190513. The reversal of 64190509 is 90509146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33698025 + 30492484 = 5805^2 + 5522^2 .

It is a cyclic number.

It is not a de Polignac number, because 64190509 - 2⁹ = 64189997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64197509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32095254 + 32095255.

It is an arithmetic number, because the mean of its divisors is an integer number (32095255).

Almost surely, 2^64190509 is an apocalyptic number.

It is an amenable number.

64190509 is a deficient number, since it is larger than the sum of its proper divisors (1).

64190509 is an equidigital number, since it uses as much as digits as its factorization.

64190509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 64190509 is about 8011.8979649019. The cubic root of 64190509 is about 400.3965005883.

The spelling of 64190509 in words is "sixty-four million, one hundred ninety thousand, five hundred nine".