64691449 has 2 divisors, whose sum is σ = 64691450. Its totient is φ = 64691448.

The previous prime is 64691413. The next prime is 64691453. The reversal of 64691449 is 94419646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64689849 + 1600 = 8043^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 64691449 - 2¹³ = 64683257 is a prime.

It is not a weakly prime, because it can be changed into another prime (64691149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32345724 + 32345725.

It is an arithmetic number, because the mean of its divisors is an integer number (32345725).

Almost surely, 2^64691449 is an apocalyptic number.

It is an amenable number.

64691449 is a deficient number, since it is larger than the sum of its proper divisors (1).

64691449 is an equidigital number, since it uses as much as digits as its factorization.

64691449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 43.

The square root of 64691449 is about 8043.0994647586. The cubic root of 64691449 is about 401.4353619294.

The spelling of 64691449 in words is "sixty-four million, six hundred ninety-one thousand, four hundred forty-nine".