64751009 has 2 divisors, whose sum is σ = 64751010. Its totient is φ = 64751008.

The previous prime is 64750979. The next prime is 64751023. The reversal of 64751009 is 90015746.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 3598609 = 7820^2 + 1897^2 .

It is a cyclic number.

It is not a de Polignac number, because 64751009 - 2⁸ = 64750753 is a prime.

It is a super-3 number, since 3×64751009³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (64751209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32375504 + 32375505.

It is an arithmetic number, because the mean of its divisors is an integer number (32375505).

Almost surely, 2^64751009 is an apocalyptic number.

It is an amenable number.

64751009 is a deficient number, since it is larger than the sum of its proper divisors (1).

64751009 is an equidigital number, since it uses as much as digits as its factorization.

64751009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 64751009 is about 8046.8011656807. The cubic root of 64751009 is about 401.5585217217.

The spelling of 64751009 in words is "sixty-four million, seven hundred fifty-one thousand, nine".