64615471 has 2 divisors, whose sum is σ = 64615472. Its totient is φ = 64615470.

The previous prime is 64615433. The next prime is 64615477. The reversal of 64615471 is 17451646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64615471 is a prime.

It is a super-3 number, since 3×64615471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64615477) 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, 32307735 + 32307736.

It is an arithmetic number, because the mean of its divisors is an integer number (32307736).

Almost surely, 2^64615471 is an apocalyptic number.

64615471 is a deficient number, since it is larger than the sum of its proper divisors (1).

64615471 is an equidigital number, since it uses as much as digits as its factorization.

64615471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 64615471 is about 8038.3748979505. The cubic root of 64615471 is about 401.2781427775.

The spelling of 64615471 in words is "sixty-four million, six hundred fifteen thousand, four hundred seventy-one".