64500409 has 2 divisors, whose sum is σ = 64500410. Its totient is φ = 64500408.

The previous prime is 64500377. The next prime is 64500463. The reversal of 64500409 is 90400546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63154809 + 1345600 = 7947^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 64500409 - 2⁵ = 64500377 is a prime.

It is a super-2 number, since 2×64500409² = 8320605522334562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64500209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32250204 + 32250205.

It is an arithmetic number, because the mean of its divisors is an integer number (32250205).

Almost surely, 2^64500409 is an apocalyptic number.

It is an amenable number.

64500409 is a deficient number, since it is larger than the sum of its proper divisors (1).

64500409 is an equidigital number, since it uses as much as digits as its factorization.

64500409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 64500409 is about 8031.2146652919. The cubic root of 64500409 is about 401.0398133781.

The spelling of 64500409 in words is "sixty-four million, five hundred thousand, four hundred nine".