64619609 has 2 divisors, whose sum is σ = 64619610. Its totient is φ = 64619608.

The previous prime is 64619587. The next prime is 64619629. The reversal of 64619609 is 90691646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64320400 + 299209 = 8020^2 + 547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64619609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64619629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32309804 + 32309805.

It is an arithmetic number, because the mean of its divisors is an integer number (32309805).

Almost surely, 2^64619609 is an apocalyptic number.

It is an amenable number.

64619609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64619609 is an equidigital number, since it uses as much as digits as its factorization.

64619609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 64619609 is about 8038.6322841638. The cubic root of 64619609 is about 401.2867085977.

The spelling of 64619609 in words is "sixty-four million, six hundred nineteen thousand, six hundred nine".