64521371 has 8 divisors (see below), whose sum is σ = 68893440. Its totient is φ = 60279912.

The previous prime is 64521367. The next prime is 64521403. The reversal of 64521371 is 17312546.

64521371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64521371 - 2² = 64521367 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64521311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31631 + ... + 33608.

It is an arithmetic number, because the mean of its divisors is an integer number (8611680).

Almost surely, 2^64521371 is an apocalyptic number.

64521371 is a deficient number, since it is larger than the sum of its proper divisors (4372069).

64521371 is a wasteful number, since it uses less digits than its factorization.

64521371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65305.

The product of its digits is 5040, while the sum is 29.

The square root of 64521371 is about 8032.5195922575. The cubic root of 64521371 is about 401.0832533406.

The spelling of 64521371 in words is "sixty-four million, five hundred twenty-one thousand, three hundred seventy-one".