64481009 has 2 divisors, whose sum is σ = 64481010. Its totient is φ = 64481008.

The previous prime is 64480979. The next prime is 64481033. The reversal of 64481009 is 90018446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37149025 + 27331984 = 6095^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 64481009 - 2²⁴ = 47703793 is a prime.

It is not a weakly prime, because it can be changed into another prime (64481609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32240504 + 32240505.

It is an arithmetic number, because the mean of its divisors is an integer number (32240505).

Almost surely, 2^64481009 is an apocalyptic number.

It is an amenable number.

64481009 is a deficient number, since it is larger than the sum of its proper divisors (1).

64481009 is an equidigital number, since it uses as much as digits as its factorization.

64481009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 64481009 is about 8030.0067870457. The cubic root of 64481009 is about 400.9996019921. Note that the first 3 decimals are identical.

The spelling of 64481009 in words is "sixty-four million, four hundred eighty-one thousand, nine".