64612409 has 2 divisors, whose sum is σ = 64612410. Its totient is φ = 64612408.

The previous prime is 64612399. The next prime is 64612411. The reversal of 64612409 is 90421646.

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., 33028009 + 31584400 = 5747^2 + 5620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64612409 is a prime.

Together with 64612411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64612439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32306204 + 32306205.

It is an arithmetic number, because the mean of its divisors is an integer number (32306205).

Almost surely, 2^64612409 is an apocalyptic number.

It is an amenable number.

64612409 is a deficient number, since it is larger than the sum of its proper divisors (1).

64612409 is an equidigital number, since it uses as much as digits as its factorization.

64612409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 64612409 is about 8038.1844343110. The cubic root of 64612409 is about 401.2718040836.

The spelling of 64612409 in words is "sixty-four million, six hundred twelve thousand, four hundred nine".