64541947 has 2 divisors, whose sum is σ = 64541948. Its totient is φ = 64541946.

The previous prime is 64541923. The next prime is 64541959. The reversal of 64541947 is 74914546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64541947 is a prime.

It is a super-4 number, since 4×64541947⁴ (a number of 32 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (64541987) 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, 32270973 + 32270974.

It is an arithmetic number, because the mean of its divisors is an integer number (32270974).

Almost surely, 2^64541947 is an apocalyptic number.

64541947 is a deficient number, since it is larger than the sum of its proper divisors (1).

64541947 is an equidigital number, since it uses as much as digits as its factorization.

64541947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 64541947 is about 8033.8002838009. The cubic root of 64541947 is about 401.1258842384.

The spelling of 64541947 in words is "sixty-four million, five hundred forty-one thousand, nine hundred forty-seven".